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diff --git a/src/croniter/tests/test_croniter_range.py b/src/croniter/tests/test_croniter_range.py
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+++ b/src/croniter/tests/test_croniter_range.py
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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import unittest
+from datetime import datetime, timedelta
+from functools import partial
+from time import sleep
+import pytz
+from croniter import croniter, croniter_range, CroniterBadDateError, CroniterBadCronError, CroniterNotAlphaError
+from croniter.tests import base
+import dateutil.tz
+
+
+class CroniterTest(base.TestCase):
+
+    def testSecondSec(self):
+        base = datetime(2012, 4, 6, 13, 26, 10)
+        itr = croniter('* * * * * 15,25', base)
+        n = itr.get_next(datetime)
+        self.assertEqual(15, n.second)
+        n = itr.get_next(datetime)
+        self.assertEqual(25, n.second)
+        n = itr.get_next(datetime)
+        self.assertEqual(15, n.second)
+        self.assertEqual(27, n.minute)
+
+    def testSecond(self):
+        base = datetime(2012, 4, 6, 13, 26, 10)
+        itr = croniter('*/1 * * * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(base.year, n1.year)
+        self.assertEqual(base.month, n1.month)
+        self.assertEqual(base.day, n1.day)
+        self.assertEqual(base.hour, n1.hour)
+        self.assertEqual(base.minute, n1.minute)
+        self.assertEqual(base.second + 1, n1.second)
+
+    def testSecondRepeat(self):
+        base = datetime(2012, 4, 6, 13, 26, 36)
+        itr = croniter('* * * * * */15', base)
+        n1 = itr.get_next(datetime)
+        n2 = itr.get_next(datetime)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(base.year, n1.year)
+        self.assertEqual(base.month, n1.month)
+        self.assertEqual(base.day, n1.day)
+        self.assertEqual(base.hour, n1.hour)
+        self.assertEqual(base.minute, n1.minute)
+        self.assertEqual(45, n1.second)
+        self.assertEqual(base.year, n2.year)
+        self.assertEqual(base.month, n2.month)
+        self.assertEqual(base.day, n2.day)
+        self.assertEqual(base.hour, n2.hour)
+        self.assertEqual(base.minute + 1, n2.minute)
+        self.assertEqual(0, n2.second)
+        self.assertEqual(base.year, n3.year)
+        self.assertEqual(base.month, n3.month)
+        self.assertEqual(base.day, n3.day)
+        self.assertEqual(base.hour, n3.hour)
+        self.assertEqual(base.minute + 1, n3.minute)
+        self.assertEqual(15, n3.second)
+
+    def testMinute(self):
+        # minute asterisk
+        base = datetime(2010, 1, 23, 12, 18)
+        itr = croniter('*/1 * * * *', base)
+        n1 = itr.get_next(datetime)    # 19
+        self.assertEqual(base.year, n1.year)
+        self.assertEqual(base.month, n1.month)
+        self.assertEqual(base.day, n1.day)
+        self.assertEqual(base.hour, n1.hour)
+        self.assertEqual(base.minute, n1.minute - 1)
+        for i in range(39):  # ~ 58
+            itr.get_next()
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.minute, 59)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.minute, 0)
+        self.assertEqual(n3.hour, 13)
+
+        itr = croniter('*/5 * * * *', base)
+        n4 = itr.get_next(datetime)
+        self.assertEqual(n4.minute, 20)
+        for i in range(6):
+            itr.get_next()
+        n5 = itr.get_next(datetime)
+        self.assertEqual(n5.minute, 55)
+        n6 = itr.get_next(datetime)
+        self.assertEqual(n6.minute, 0)
+        self.assertEqual(n6.hour, 13)
+
+    def testHour(self):
+        base = datetime(2010, 1, 24, 12, 2)
+        itr = croniter('0 */3 * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 15)
+        self.assertEqual(n1.minute, 0)
+        for i in range(2):
+            itr.get_next()
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.hour, 0)
+        self.assertEqual(n2.day, 25)
+
+    def testDay(self):
+        base = datetime(2010, 2, 24, 12, 9)
+        itr = croniter('0 0 */3 * *', base)
+        n1 = itr.get_next(datetime)
+        # 1 4 7 10 13 16 19 22 25 28
+        self.assertEqual(n1.day, 25)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.day, 28)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.day, 1)
+        self.assertEqual(n3.month, 3)
+
+        # test leap year
+        base = datetime(1996, 2, 27)
+        itr = croniter('0 0 * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.day, 28)
+        self.assertEqual(n1.month, 2)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.day, 29)
+        self.assertEqual(n2.month, 2)
+
+        base2 = datetime(2000, 2, 27)
+        itr2 = croniter('0 0 * * *', base2)
+        n3 = itr2.get_next(datetime)
+        self.assertEqual(n3.day, 28)
+        self.assertEqual(n3.month, 2)
+        n4 = itr2.get_next(datetime)
+        self.assertEqual(n4.day, 29)
+        self.assertEqual(n4.month, 2)
+
+    def testWeekDay(self):
+        base = datetime(2010, 2, 25)
+        itr = croniter('0 0 * * sat', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.isoweekday(), 6)
+        self.assertEqual(n1.day, 27)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.isoweekday(), 6)
+        self.assertEqual(n2.day, 6)
+        self.assertEqual(n2.month, 3)
+
+        base = datetime(2010, 1, 25)
+        itr = croniter('0 0 1 * wed', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 1)
+        self.assertEqual(n1.day, 27)
+        self.assertEqual(n1.year, 2010)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 2)
+        self.assertEqual(n2.day, 1)
+        self.assertEqual(n2.year, 2010)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.month, 2)
+        self.assertEqual(n3.day, 3)
+        self.assertEqual(n3.year, 2010)
+
+    def testNthWeekDay(self):
+        base = datetime(2010, 2, 25)
+        itr = croniter('0 0 * * sat#1', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.isoweekday(), 6)
+        self.assertEqual(n1.day, 6)
+        self.assertEqual(n1.month, 3)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.isoweekday(), 6)
+        self.assertEqual(n2.day, 3)
+        self.assertEqual(n2.month, 4)
+
+        base = datetime(2010, 1, 25)
+        itr = croniter('0 0 * * wed#5', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 3)
+        self.assertEqual(n1.day, 31)
+        self.assertEqual(n1.year, 2010)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 6)
+        self.assertEqual(n2.day, 30)
+        self.assertEqual(n2.year, 2010)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.month, 9)
+        self.assertEqual(n3.day, 29)
+        self.assertEqual(n3.year, 2010)
+
+    def testWeekDayDayAnd(self):
+        base = datetime(2010, 1, 25)
+        itr = croniter('0 0 1 * mon', base, day_or=False)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 1)
+        self.assertEqual(n1.year, 2010)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 3)
+        self.assertEqual(n2.day, 1)
+        self.assertEqual(n2.year, 2010)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.month, 11)
+        self.assertEqual(n3.day, 1)
+        self.assertEqual(n3.year, 2010)
+
+    def testMonth(self):
+        base = datetime(2010, 1, 25)
+        itr = croniter('0 0 1 * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 1)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 3)
+        self.assertEqual(n2.day, 1)
+        for i in range(8):
+            itr.get_next()
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.month, 12)
+        self.assertEqual(n3.year, 2010)
+        n4 = itr.get_next(datetime)
+        self.assertEqual(n4.month, 1)
+        self.assertEqual(n4.year, 2011)
+
+    def testLastDayOfMonth(self):
+        base = datetime(2015, 9, 4)
+        itr = croniter('0 0 l * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 9)
+        self.assertEqual(n1.day, 30)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 10)
+        self.assertEqual(n2.day, 31)
+        n3 = itr.get_next(datetime)
+        self.assertEqual(n3.month, 11)
+        self.assertEqual(n3.day, 30)
+        n4 = itr.get_next(datetime)
+        self.assertEqual(n4.month, 12)
+        self.assertEqual(n4.day, 31)
+
+    def testRangeWithUppercaseLastDayOfMonth(self):
+        base = datetime(2015, 9, 4)
+        itr = croniter('0 0 29-L * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.month, 9)
+        self.assertEqual(n1.day, 29)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.month, 9)
+        self.assertEqual(n2.day, 30)
+
+    def testPrevLastDayOfMonth(self):
+        base = datetime(2009, 12, 31, hour=20)
+        itr = croniter('0 0 l * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 12)
+        self.assertEqual(n1.day, 31)
+
+        base = datetime(2009, 12, 31)
+        itr = croniter('0 0 l * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 11)
+        self.assertEqual(n1.day, 30)
+
+        base = datetime(2010, 1, 5)
+        itr = croniter('0 0 l * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 12)
+        self.assertEqual(n1.day, 31)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 11)
+        self.assertEqual(n1.day, 30)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 10)
+        self.assertEqual(n1.day, 31)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 9)
+        self.assertEqual(n1.day, 30)
+
+        base = datetime(2010, 1, 31, minute=2)
+        itr = croniter('* * l * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 1)
+        self.assertEqual(n1.day, 31)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 1)
+        self.assertEqual(n1.day, 31)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 12)
+        self.assertEqual(n1.day, 31)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.month, 12)
+        self.assertEqual(n1.day, 31)
+
+    def testError(self):
+        itr = croniter('* * * * *')
+        self.assertRaises(TypeError, itr.get_next, str)
+        self.assertRaises(ValueError, croniter, '* * * *')
+        self.assertRaises(ValueError, croniter, '* * 5-1 * *')
+        self.assertRaises(ValueError, croniter, '-90 * * * *')
+        self.assertRaises(ValueError, croniter, 'a * * * *')
+        self.assertRaises(ValueError, croniter, '* * * janu-jun *')
+        self.assertRaises(ValueError, croniter, '1-1_0 * * * *')
+        self.assertRaises(ValueError, croniter, '0-10/ * * * *')
+        self.assertRaises(CroniterBadCronError, croniter, "0-1& * * * *", datetime.now())
+
+    def testSundayToThursdayWithAlphaConversion(self):
+        base = datetime(2010, 8, 25, 15, 56)  # wednesday
+        itr = croniter("30 22 * * sun-thu", base)
+        next = itr.get_next(datetime)
+
+        self.assertEqual(base.year, next.year)
+        self.assertEqual(base.month, next.month)
+        self.assertEqual(base.day, next.day)
+        self.assertEqual(22, next.hour)
+        self.assertEqual(30, next.minute)
+
+    def testOptimizeCronExpressions(self):
+        """ Non-optimal cron expressions that can be simplified."""
+        wildcard = ['*']
+        m, h, d, mon, dow, s = range(6)
+        # Test each field individually
+        self.assertEqual(croniter('0-59 0 0 0 0').expanded[m], wildcard)
+        self.assertEqual(croniter('0 0-23 0 0 0').expanded[h], wildcard)
+        self.assertEqual(croniter('0 0 0-31 0 0').expanded[d], wildcard)
+        self.assertEqual(croniter('0 0 0 1-12 0').expanded[mon], wildcard)
+        self.assertEqual(croniter('0 0 0 0 0-6').expanded[dow], wildcard)
+        self.assertEqual(croniter('0 0 0 0 1-7').expanded[dow], wildcard)
+        self.assertEqual(croniter('0 0 0 0 0 0-59').expanded[s], wildcard)
+        # Real life examples
+        self.assertEqual(croniter('30 1-12,0,10-23 15-21 * fri').expanded[h], wildcard)
+        self.assertEqual(croniter('30 1-23,0 15-21 * fri').expanded[h], wildcard)
+
+    def testBlockDupRanges(self):
+        """ Ensure that duplicate/overlapping ranges are squashed """
+        m, h, d, mon, dow, s = range(6)
+        self.assertEqual(croniter('* 5,5,1-6 * * *').expanded[h], [1,2,3,4,5,6])
+        self.assertEqual(croniter('* * * * 2-3,4-5,3,3,3').expanded[dow], [2,3,4,5])
+        self.assertEqual(croniter('* * * * * 1,5,*/20,20,15').expanded[s], [0, 1, 5, 15, 20, 40])
+        self.assertEqual(croniter('* 4,1-4,5,4 * * *').expanded[h], [1, 2, 3, 4, 5])
+        # Real life example
+        self.assertEqual(croniter('59 23 * 1 wed,fri,mon-thu,tue,tue').expanded[dow], [1,2,3,4,5])
+
+    def testPrevMinute(self):
+        base = datetime(2010, 8, 25, 15, 56)
+        itr = croniter('*/1 * * * *', base)
+        prev = itr.get_prev(datetime)
+        self.assertEqual(base.year, prev.year)
+        self.assertEqual(base.month, prev.month)
+        self.assertEqual(base.day, prev.day)
+        self.assertEqual(base.hour, prev.hour)
+        self.assertEqual(base.minute, prev.minute + 1)
+
+        base = datetime(2010, 8, 25, 15, 0)
+        itr = croniter('*/1 * * * *', base)
+        prev = itr.get_prev(datetime)
+        self.assertEqual(base.year, prev.year)
+        self.assertEqual(base.month, prev.month)
+        self.assertEqual(base.day, prev.day)
+        self.assertEqual(base.hour, prev.hour + 1)
+        self.assertEqual(59, prev.minute)
+
+        base = datetime(2010, 8, 25, 0, 0)
+        itr = croniter('*/1 * * * *', base)
+        prev = itr.get_prev(datetime)
+        self.assertEqual(base.year, prev.year)
+        self.assertEqual(base.month, prev.month)
+        self.assertEqual(base.day, prev.day + 1)
+        self.assertEqual(23, prev.hour)
+        self.assertEqual(59, prev.minute)
+
+    def testPrevDayOfMonthWithCrossing(self):
+        """
+        Test getting previous occurrence that crosses into previous month.
+        """
+        base = datetime(2012, 3, 15, 0, 0)
+        itr = croniter('0 0 22 * *', base)
+        prev = itr.get_prev(datetime)
+        self.assertEqual(prev.year, 2012)
+        self.assertEqual(prev.month, 2)
+        self.assertEqual(prev.day, 22)
+        self.assertEqual(prev.hour, 0)
+        self.assertEqual(prev.minute, 0)
+
+    def testPrevWeekDay(self):
+        base = datetime(2010, 8, 25, 15, 56)
+        itr = croniter('0 0 * * sat,sun', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, base.month)
+        self.assertEqual(prev1.day, 22)
+        self.assertEqual(prev1.hour, 0)
+        self.assertEqual(prev1.minute, 0)
+
+        prev2 = itr.get_prev(datetime)
+        self.assertEqual(prev2.year, base.year)
+        self.assertEqual(prev2.month, base.month)
+        self.assertEqual(prev2.day, 21)
+        self.assertEqual(prev2.hour, 0)
+        self.assertEqual(prev2.minute, 0)
+
+        prev3 = itr.get_prev(datetime)
+        self.assertEqual(prev3.year, base.year)
+        self.assertEqual(prev3.month, base.month)
+        self.assertEqual(prev3.day, 15)
+        self.assertEqual(prev3.hour, 0)
+        self.assertEqual(prev3.minute, 0)
+
+    def testPrevNthWeekDay(self):
+        base = datetime(2010, 8, 25, 15, 56)
+        itr = croniter('0 0 * * sat#1,sun#2', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, base.month)
+        self.assertEqual(prev1.day, 8)
+        self.assertEqual(prev1.hour, 0)
+        self.assertEqual(prev1.minute, 0)
+
+        prev2 = itr.get_prev(datetime)
+        self.assertEqual(prev2.year, base.year)
+        self.assertEqual(prev2.month, base.month)
+        self.assertEqual(prev2.day, 7)
+        self.assertEqual(prev2.hour, 0)
+        self.assertEqual(prev2.minute, 0)
+
+        prev3 = itr.get_prev(datetime)
+        self.assertEqual(prev3.year, base.year)
+        self.assertEqual(prev3.month, 7)
+        self.assertEqual(prev3.day, 11)
+        self.assertEqual(prev3.hour, 0)
+        self.assertEqual(prev3.minute, 0)
+
+    def testPrevWeekDay2(self):
+        base = datetime(2010, 8, 25, 15, 56)
+        itr = croniter('10 0 * * 0', base)
+        prev = itr.get_prev(datetime)
+        self.assertEqual(prev.day, 22)
+        self.assertEqual(prev.hour, 0)
+        self.assertEqual(prev.minute, 10)
+
+    def testISOWeekday(self):
+        base = datetime(2010, 2, 25)
+        itr = croniter('0 0 * * 7', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.isoweekday(), 7)
+        self.assertEqual(n1.day, 28)
+        n2 = itr.get_next(datetime)
+        self.assertEqual(n2.isoweekday(), 7)
+        self.assertEqual(n2.day, 7)
+        self.assertEqual(n2.month, 3)
+
+    def testBug1(self):
+        base = datetime(2012, 2, 24)
+        itr = croniter('5 0 */2 * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.hour, 0)
+        self.assertEqual(n1.minute, 5)
+        self.assertEqual(n1.month, 2)
+        # month starts from 1, 3 .... then 21, 23
+        # so correct is not 22  but 23
+        self.assertEqual(n1.day, 23)
+
+    def testBug2(self):
+        base = datetime(2012, 1, 1, 0, 0)
+        iter = croniter('0 * * 3 *', base)
+        n1 = iter.get_next(datetime)
+        self.assertEqual(n1.year, base.year)
+        self.assertEqual(n1.month, 3)
+        self.assertEqual(n1.day, base.day)
+        self.assertEqual(n1.hour, base.hour)
+        self.assertEqual(n1.minute, base.minute)
+
+        n2 = iter.get_next(datetime)
+        self.assertEqual(n2.year, base.year)
+        self.assertEqual(n2.month, 3)
+        self.assertEqual(n2.day, base.day)
+        self.assertEqual(n2.hour, base.hour + 1)
+        self.assertEqual(n2.minute, base.minute)
+
+        n3 = iter.get_next(datetime)
+        self.assertEqual(n3.year, base.year)
+        self.assertEqual(n3.month, 3)
+        self.assertEqual(n3.day, base.day)
+        self.assertEqual(n3.hour, base.hour + 2)
+        self.assertEqual(n3.minute, base.minute)
+
+    def testBug3(self):
+        base = datetime(2013, 3, 1, 12, 17, 34, 257877)
+        c = croniter('00 03 16,30 * *', base)
+
+        n1 = c.get_next(datetime)
+        self.assertEqual(n1.month, 3)
+        self.assertEqual(n1.day, 16)
+
+        n2 = c.get_next(datetime)
+        self.assertEqual(n2.month, 3)
+        self.assertEqual(n2.day, 30)
+
+        n3 = c.get_next(datetime)
+        self.assertEqual(n3.month, 4)
+        self.assertEqual(n3.day, 16)
+
+        n4 = c.get_prev(datetime)
+        self.assertEqual(n4.month, 3)
+        self.assertEqual(n4.day, 30)
+
+        n5 = c.get_prev(datetime)
+        self.assertEqual(n5.month, 3)
+        self.assertEqual(n5.day, 16)
+
+        n6 = c.get_prev(datetime)
+        self.assertEqual(n6.month, 2)
+        self.assertEqual(n6.day, 16)
+
+    def test_bug34(self):
+        base = datetime(2012, 2, 24, 0, 0, 0)
+        itr = croniter('* * 31 2 *', base)
+        try:
+            itr.get_next(datetime)
+        except (CroniterBadDateError,) as ex:
+            self.assertEqual("{0}".format(ex),
+                             'failed to find next date')
+
+    def testBug57(self):
+        base = datetime(2012, 2, 24, 0, 0, 0)
+        itr = croniter('0 4/6 * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 4)
+        self.assertEqual(n1.minute, 0)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 24)
+
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.hour, 22)
+        self.assertEqual(n1.minute, 0)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 23)
+
+        itr = croniter('0 0/6 * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 6)
+        self.assertEqual(n1.minute, 0)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 24)
+
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(n1.hour, 0)
+        self.assertEqual(n1.minute, 0)
+        self.assertEqual(n1.month, 2)
+        self.assertEqual(n1.day, 24)
+
+    def test_multiple_months(self):
+        base = datetime(2016, 3, 1, 0, 0, 0)
+        itr = croniter('0 0 1 3,6,9,12 *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 0)
+        self.assertEqual(n1.month, 6)
+        self.assertEqual(n1.day, 1)
+        self.assertEqual(n1.year, 2016)
+
+        base = datetime(2016, 2, 15, 0, 0, 0)
+        itr = croniter('0 0 1 3,6,9,12 *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 0)
+        self.assertEqual(n1.month, 3)
+        self.assertEqual(n1.day, 1)
+        self.assertEqual(n1.year, 2016)
+
+        base = datetime(2016, 12, 3, 10, 0, 0)
+        itr = croniter('0 0 1 3,6,9,12 *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.hour, 0)
+        self.assertEqual(n1.month, 3)
+        self.assertEqual(n1.day, 1)
+        self.assertEqual(n1.year, 2017)
+
+        # The result with this parameters was incorrect.
+        # self.assertEqual(p1.month, 12
+        # AssertionError: 9 != 12
+        base = datetime(2016, 3, 1, 0, 0, 0)
+        itr = croniter('0 0 1 3,6,9,12 *', base)
+        p1 = itr.get_prev(datetime)
+        self.assertEqual(p1.hour, 0)
+        self.assertEqual(p1.month, 12)
+        self.assertEqual(p1.day, 1)
+        self.assertEqual(p1.year, 2015)
+
+        # check my change resolves another hidden bug.
+        base = datetime(2016, 2, 1, 0, 0, 0)
+        itr = croniter('0 0 1,15,31 * *', base)
+        p1 = itr.get_prev(datetime)
+        self.assertEqual(p1.hour, 0)
+        self.assertEqual(p1.month, 1)
+        self.assertEqual(p1.day, 31)
+        self.assertEqual(p1.year, 2016)
+
+        base = datetime(2016, 6, 1, 0, 0, 0)
+        itr = croniter('0 0 1 3,6,9,12 *', base)
+        p1 = itr.get_prev(datetime)
+        self.assertEqual(p1.hour, 0)
+        self.assertEqual(p1.month, 3)
+        self.assertEqual(p1.day, 1)
+        self.assertEqual(p1.year, 2016)
+
+        base = datetime(2016, 3, 1, 0, 0, 0)
+        itr = croniter('0 0 1 1,3,6,9,12 *', base)
+        p1 = itr.get_prev(datetime)
+        self.assertEqual(p1.hour, 0)
+        self.assertEqual(p1.month, 1)
+        self.assertEqual(p1.day, 1)
+        self.assertEqual(p1.year, 2016)
+
+        base = datetime(2016, 3, 1, 0, 0, 0)
+        itr = croniter('0 0 1 1,3,6,9,12 *', base)
+        p1 = itr.get_prev(datetime)
+        self.assertEqual(p1.hour, 0)
+        self.assertEqual(p1.month, 1)
+        self.assertEqual(p1.day, 1)
+        self.assertEqual(p1.year, 2016)
+
+    def test_rangeGenerator(self):
+        base = datetime(2013, 3, 4, 0, 0)
+        itr = croniter('1-9/2 0 1 * *', base)
+        n1 = itr.get_next(datetime)
+        n2 = itr.get_next(datetime)
+        n3 = itr.get_next(datetime)
+        n4 = itr.get_next(datetime)
+        n5 = itr.get_next(datetime)
+        self.assertEqual(n1.minute, 1)
+        self.assertEqual(n2.minute, 3)
+        self.assertEqual(n3.minute, 5)
+        self.assertEqual(n4.minute, 7)
+        self.assertEqual(n5.minute, 9)
+
+    def testPreviousHour(self):
+        base = datetime(2012, 6, 23, 17, 41)
+        itr = croniter('* 10 * * *', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, base.month)
+        self.assertEqual(prev1.day, base.day)
+        self.assertEqual(prev1.hour, 10)
+        self.assertEqual(prev1.minute, 59)
+
+    def testPreviousDay(self):
+        base = datetime(2012, 6, 27, 0, 15)
+        itr = croniter('* * 26 * *', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, base.month)
+        self.assertEqual(prev1.day, 26)
+        self.assertEqual(prev1.hour, 23)
+        self.assertEqual(prev1.minute, 59)
+
+    def testPreviousMonth(self):
+        base = datetime(2012, 6, 18, 0, 15)
+        itr = croniter('* * * 5 *', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, 5)
+        self.assertEqual(prev1.day, 31)
+        self.assertEqual(prev1.hour, 23)
+        self.assertEqual(prev1.minute, 59)
+
+    def testPreviousDow(self):
+        base = datetime(2012, 5, 13, 18, 48)
+        itr = croniter('* * * * sat', base)
+        prev1 = itr.get_prev(datetime)
+        self.assertEqual(prev1.year, base.year)
+        self.assertEqual(prev1.month, base.month)
+        self.assertEqual(prev1.day, 12)
+        self.assertEqual(prev1.hour, 23)
+        self.assertEqual(prev1.minute, 59)
+
+    def testGetCurrent(self):
+        base = datetime(2012, 9, 25, 11, 24)
+        itr = croniter('* * * * *', base)
+        res = itr.get_current(datetime)
+        self.assertEqual(base.year, res.year)
+        self.assertEqual(base.month, res.month)
+        self.assertEqual(base.day, res.day)
+        self.assertEqual(base.hour, res.hour)
+        self.assertEqual(base.minute, res.minute)
+
+    def testTimezone(self):
+        base = datetime(2013, 3, 4, 12, 15)
+        itr = croniter('* * * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.tzinfo, None)
+
+        tokyo = pytz.timezone('Asia/Tokyo')
+        itr2 = croniter('* * * * *', tokyo.localize(base))
+        n2 = itr2.get_next(datetime)
+        self.assertEqual(n2.tzinfo.zone, 'Asia/Tokyo')
+
+    def testTimezoneDateutil(self):
+        tokyo = dateutil.tz.gettz('Asia/Tokyo')
+        base = datetime(2013, 3, 4, 12, 15, tzinfo=tokyo)
+        itr = croniter('* * * * *', base)
+        n1 = itr.get_next(datetime)
+        self.assertEqual(n1.tzinfo.tzname(n1), 'JST')
+
+    def testInitNoStartTime(self):
+        itr = croniter('* * * * *')
+        sleep(.01)
+        itr2 = croniter('* * * * *')
+        # Greater dosnt exists in py26
+        self.assertTrue(itr2.cur > itr.cur)
+
+    def assertScheduleTimezone(self, callback, expected_schedule):
+        for expected_date, expected_offset in expected_schedule:
+            d = callback()
+            self.assertEqual(expected_date, d.replace(tzinfo=None))
+            self.assertEqual(expected_offset,
+                             croniter._timedelta_to_seconds(d.utcoffset()))
+
+    def testTimezoneWinterTime(self):
+        tz = pytz.timezone('Europe/Athens')
+
+        expected_schedule = [
+            (datetime(2013, 10, 27, 2, 30, 0), 10800),
+            (datetime(2013, 10, 27, 3, 0, 0), 10800),
+            (datetime(2013, 10, 27, 3, 30, 0), 10800),
+            (datetime(2013, 10, 27, 3, 0, 0), 7200),
+            (datetime(2013, 10, 27, 3, 30, 0), 7200),
+            (datetime(2013, 10, 27, 4, 0, 0), 7200),
+            (datetime(2013, 10, 27, 4, 30, 0), 7200),
+            ]
+
+        start = datetime(2013, 10, 27, 2, 0, 0)
+        ct = croniter('*/30 * * * *', tz.localize(start))
+        self.assertScheduleTimezone(lambda: ct.get_next(datetime), expected_schedule)
+
+        start = datetime(2013, 10, 27, 5, 0, 0)
+        ct = croniter('*/30 * * * *', tz.localize(start))
+        self.assertScheduleTimezone(lambda: ct.get_prev(datetime), reversed(expected_schedule))
+
+    def testTimezoneSummerTime(self):
+        tz = pytz.timezone('Europe/Athens')
+
+        expected_schedule = [
+            (datetime(2013, 3, 31, 1, 30, 0), 7200),
+            (datetime(2013, 3, 31, 2, 0, 0), 7200),
+            (datetime(2013, 3, 31, 2, 30, 0), 7200),
+            (datetime(2013, 3, 31, 4, 0, 0), 10800),
+            (datetime(2013, 3, 31, 4, 30, 0), 10800),
+            ]
+
+        start = datetime(2013, 3, 31, 1, 0, 0)
+        ct = croniter('*/30 * * * *', tz.localize(start))
+        self.assertScheduleTimezone(lambda: ct.get_next(datetime), expected_schedule)
+
+        start = datetime(2013, 3, 31, 5, 0, 0)
+        ct = croniter('*/30 * * * *', tz.localize(start))
+        self.assertScheduleTimezone(lambda: ct.get_prev(datetime), reversed(expected_schedule))
+
+    def test_std_dst(self):
+        """
+        DST tests
+
+        This fixes https://github.com/taichino/croniter/issues/82
+
+        """
+        tz = pytz.timezone('Europe/Warsaw')
+        # -> 2017-03-26 01:59+1:00 -> 03:00+2:00
+        local_date = tz.localize(datetime(2017, 3, 26))
+        val = croniter('0 0 * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 3, 27)))
+        #
+        local_date = tz.localize(datetime(2017, 3, 26, 1))
+        cr = croniter('0 * * * *', local_date)
+        val = cr.get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 3, 26, 3)))
+        val = cr.get_current(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 3, 26, 3)))
+
+        # -> 2017-10-29 02:59+2:00 -> 02:00+1:00
+        local_date = tz.localize(datetime(2017, 10, 29))
+        val = croniter('0 0 * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 10, 30)))
+        local_date = tz.localize(datetime(2017, 10, 29, 1, 59))
+        val = croniter('0 * * * *', local_date).get_next(datetime)
+        self.assertEqual(
+            val.replace(tzinfo=None),
+            tz.localize(datetime(2017, 10, 29, 2)).replace(tzinfo=None))
+        local_date = tz.localize(datetime(2017, 10, 29, 2))
+        val = croniter('0 * * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 10, 29, 3)))
+        local_date = tz.localize(datetime(2017, 10, 29, 3))
+        val = croniter('0 * * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 10, 29, 4)))
+        local_date = tz.localize(datetime(2017, 10, 29, 4))
+        val = croniter('0 * * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 10, 29, 5)))
+        local_date = tz.localize(datetime(2017, 10, 29, 5))
+        val = croniter('0 * * * *', local_date).get_next(datetime)
+        self.assertEqual(val, tz.localize(datetime(2017, 10, 29, 6)))
+
+    def test_std_dst2(self):
+        """
+        DST tests
+
+        This fixes https://github.com/taichino/croniter/issues/87
+
+        São Paulo, Brazil: 18/02/2018 00:00 -> 17/02/2018 23:00
+
+        """
+        tz = pytz.timezone("America/Sao_Paulo")
+        local_dates = [
+            # 17-22: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 21, 0, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 17-23: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 22, 0, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 17-23: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 23, 0, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 18-00: 00 -> 19-00:00
+            (tz.localize(datetime(2018, 2, 18, 0, 0, 0)),
+             '2018-02-19 00:00:00-03:00'),
+            # 17-22: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 21, 5, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 17-23: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 22, 5, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 17-23: 00 -> 18-00:00
+            (tz.localize(datetime(2018, 2, 17, 23, 5, 0)),
+             '2018-02-18 00:00:00-03:00'),
+            # 18-00: 00 -> 19-00:00
+            (tz.localize(datetime(2018, 2, 18, 0, 5, 0)),
+             '2018-02-19 00:00:00-03:00'),
+        ]
+        ret1 = [croniter("0 0 * * *", d[0]).get_next(datetime)
+                for d in local_dates]
+        sret1 = ['{0}'.format(d) for d in ret1]
+        lret1 = ['{0}'.format(d[1]) for d in local_dates]
+        self.assertEqual(sret1, lret1)
+
+    def test_std_dst3(self):
+        """
+        DST tests
+
+        This fixes https://github.com/taichino/croniter/issues/90
+
+        Adelaide, Australia: 15/04/2020 00:00 -> 15/03/2020
+
+        """
+
+        tz = pytz.timezone('Australia/Adelaide')
+
+        schedule = croniter('0 0 24 * *', tz.localize(datetime(2020, 4,15)))
+        val1 = schedule.get_prev(datetime)
+        dt1 = tz.localize(datetime(2020, 3, 24))
+        self.assertEqual(val1, dt1)
+
+        val2 = schedule.get_next(datetime)
+        dt2 = tz.localize(datetime(2020, 4, 24))
+        self.assertEqual(val2, dt2)
+
+    def test_error_alpha_cron(self):
+        self.assertRaises(CroniterNotAlphaError, croniter.expand,
+                          '* * * janu-jun *')
+
+    def test_error_bad_cron(self):
+        self.assertRaises(CroniterBadCronError, croniter.expand,
+                          '* * * *')
+        self.assertRaises(CroniterBadCronError, croniter.expand,
+                          '* * * * * * *')
+
+    def test_is_valid(self):
+        self.assertTrue(croniter.is_valid('0 * * * *'))
+        self.assertFalse(croniter.is_valid('0 * *'))
+        self.assertFalse(croniter.is_valid('* * * janu-jun *'))
+
+    def test_exactly_the_same_minute(self):
+        base = datetime(2018, 3, 5, 12, 30, 50)
+        itr = croniter('30 7,12,17 * * *', base)
+        n1 = itr.get_prev(datetime)
+        self.assertEqual(12, n1.hour)
+
+        n2 = itr.get_prev(datetime)
+        self.assertEqual(7, n2.hour)
+
+        n3 = itr.get_next(datetime)
+        self.assertEqual(12, n3.hour)
+
+    def test_next_when_now_satisfies_cron(self):
+        ts_a = datetime(2018, 5, 21, 0, 3, 0)
+        ts_b = datetime(2018, 5, 21, 0, 4, 20)
+        test_cron = '4 * * * *'
+
+        next_a = croniter(test_cron, start_time=ts_a).get_next()
+        next_b = croniter(test_cron, start_time=ts_b).get_next()
+
+        self.assertTrue(next_b > next_a)
+
+    def test_milliseconds(self):
+        """
+        https://github.com/taichino/croniter/issues/107
+        """
+
+        _croniter = partial(croniter, "0 10 * * *", ret_type=datetime)
+
+        dt = datetime(2018, 1, 2, 10, 0, 0, 500)
+        self.assertEqual(
+            _croniter(start_time=dt).get_prev(),
+            datetime(2018, 1, 2, 10, 0),
+        )
+        self.assertEqual(
+            _croniter(start_time=dt).get_next(),
+            datetime(2018, 1, 3, 10, 0),
+        )
+
+        dt = datetime(2018, 1, 2, 10, 0, 1, 0)
+        self.assertEqual(
+            _croniter(start_time=dt).get_prev(),
+            datetime(2018, 1, 2, 10, 0),
+        )
+        self.assertEqual(
+            _croniter(start_time=dt).get_next(),
+            datetime(2018, 1, 3, 10, 0),
+        )
+
+        dt = datetime(2018, 1, 2, 9, 59, 59, 999999)
+        self.assertEqual(
+            _croniter(start_time=dt).get_prev(),
+            datetime(2018, 1, 1, 10, 0),
+        )
+        self.assertEqual(
+            _croniter(start_time=dt).get_next(),
+            datetime(2018, 1, 2, 10, 0),
+        )
+
+    def test_invalid_zerorepeat(self):
+        self.assertFalse(croniter.is_valid('*/0 * * * *'))
+
+    def test_weekday_range(self):
+        ret = []
+        # jan 14 is monday
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            c = croniter("0 0 * * 2-4 *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEqual(
+            sret,
+            ['2019-01-15 00:00:00',
+             '2019-01-16 00:00:01',
+             '2019-01-17 00:00:02',
+             '2019-01-22 00:00:00',
+             '2019-01-23 00:00:01',
+             '2019-01-24 00:00:02',
+             '2019-01-29 00:00:00',
+             '2019-01-30 00:00:01',
+             '2019-01-31 00:00:02',
+             '2019-02-05 00:00:00'])
+        ret = []
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            c = croniter("0 0 * * 1-7 *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEqual(
+            sret,
+            ['2019-01-14 00:00:01',
+             '2019-01-15 00:00:02',
+             '2019-01-16 00:00:03',
+             '2019-01-17 00:00:04',
+             '2019-01-18 00:00:05',
+             '2019-01-19 00:00:06',
+             '2019-01-20 00:00:07',
+             '2019-01-21 00:00:08',
+             '2019-01-22 00:00:09',
+             '2019-01-23 00:00:10'])
+
+    def test_issue_monsun_117(self):
+        ret = []
+        dt = datetime(2019, 1, 14, 0, 0, 0, 0)
+        for i in range(10):
+            # c = croniter("0 0 * * Mon-Sun *", start_time=dt)
+            c = croniter("0 0 * * Wed-Sun *", start_time=dt)
+            dt = datetime.utcfromtimestamp(c.get_next())
+            ret.append(dt)
+            dt += timedelta(days=1)
+        sret = ["{0}".format(r) for r in ret]
+        self.assertEqual(
+            sret,
+            ['2019-01-16 00:00:00',
+             '2019-01-17 00:00:01',
+             '2019-01-18 00:00:02',
+             '2019-01-19 00:00:03',
+             '2019-01-20 00:00:04',
+             '2019-01-23 00:00:00',
+             '2019-01-24 00:00:01',
+             '2019-01-25 00:00:02',
+             '2019-01-26 00:00:03',
+             '2019-01-27 00:00:04'])
+
+    def test_mixdow(self):
+        base = datetime(2018, 10, 1, 0, 0)
+        itr = croniter('1 1 7,14,21,L * *', base)
+        self.assertTrue(isinstance(itr.get_next(), float))
+
+    def test_match(self):
+        self.assertTrue(croniter.match(
+            "0 0 * * *",
+            datetime(2019, 1, 14, 0, 0, 0, 0)
+        ))
+        self.assertFalse(croniter.match(
+            "0 0 * * *",
+            datetime(2019, 1, 14, 0, 1, 0, 0)
+        ))
+        self.assertTrue(croniter.match(
+            "31 * * * *",
+            datetime(2019, 1, 14, 1, 31, 0, 0)
+        ))
+        self.assertTrue(croniter.match(
+            "0 0 10 * wed",
+            datetime(2020, 6, 10, 0, 0, 0, 0),
+            day_or=True
+        ))
+        self.assertTrue(croniter.match(
+            "0 0 10 * fri",
+            datetime(2020, 6, 10, 0, 0, 0, 0),
+            day_or=True
+        ))
+        self.assertTrue(croniter.match(
+            "0 0 10 * fri",
+            datetime(2020, 6, 12, 0, 0, 0, 0),
+            day_or=True
+        ))
+        self.assertTrue(croniter.match(
+            "0 0 10 * wed",
+            datetime(2020, 6, 10, 0, 0, 0, 0),
+            day_or=False
+        ))
+        self.assertFalse(croniter.match(
+            "0 0 10 * fri",
+            datetime(2020, 6, 10, 0, 0, 0, 0),
+            day_or=False
+        ))
+        self.assertFalse(croniter.match(
+            "0 0 10 * fri",
+            datetime(2020, 6, 12, 0, 0, 0, 0),
+            day_or=False
+        ))
+
+
+    def test_dst_issue90_st31ny(self):
+        tz = pytz.timezone("Europe/Paris")
+        now = datetime(2020, 3, 29, 1, 59, 55, tzinfo=tz)
+        it = croniter('1 2 * * *', now)
+        #
+        # Taking around DST @ 29/03/20 01:59
+        #
+        ret = [
+            it.get_next(datetime).isoformat(),
+            it.get_prev(datetime).isoformat(),
+            it.get_prev(datetime).isoformat(),
+            it.get_next(datetime).isoformat(),
+            it.get_next(datetime).isoformat(),
+        ]
+        self.assertEqual(ret, [
+            '2020-03-30T02:01:00+02:00',
+            '2020-03-29T01:01:00+01:00',
+            '2020-03-28T03:01:00+01:00',
+            '2020-03-29T02:01:00+02:00',
+            '2020-03-29T03:01:00+02:00'])
+        #
+        nowp = datetime(2020, 3, 28, 1, 58, 55, tzinfo=tz)
+        itp = croniter('1 2 * * *', nowp)
+        retp = [
+            itp.get_next(datetime).isoformat(),
+            itp.get_prev(datetime).isoformat(),
+            itp.get_prev(datetime).isoformat(),
+            itp.get_next(datetime).isoformat(),
+            itp.get_next(datetime).isoformat(),
+        ]
+        self.assertEqual(retp, [
+            '2020-03-29T02:01:00+02:00',
+            '2020-03-28T02:01:00+01:00',
+            '2020-03-27T02:01:00+01:00',
+            '2020-03-28T02:01:00+01:00',
+            '2020-03-29T03:01:00+02:00'])
+        #
+        nowt = datetime(2020, 3, 29, 2, 0, 0, tzinfo=tz)
+        itt = croniter('1 2 * * *', nowt)
+        rett = [
+            itt.get_next(datetime).isoformat(),
+            itt.get_prev(datetime).isoformat(),
+            itt.get_prev(datetime).isoformat(),
+            itt.get_next(datetime).isoformat(),
+            itt.get_next(datetime).isoformat(),
+        ]
+        self.assertEqual(rett, [
+            '2020-03-30T02:01:00+02:00',
+            '2020-03-29T01:01:00+01:00',
+            '2020-03-28T03:01:00+01:00',
+            '2020-03-29T02:01:00+02:00',
+            '2020-03-29T03:01:00+02:00'])
+
+
+class CroniterRangeTest(base.TestCase):
+
+    def test_1day_step(self):
+        start = datetime(2016, 12, 2)
+        stop = datetime(2016, 12, 10)
+        fwd = list(croniter_range(start, stop, '0 0 * * *'))
+        self.assertEqual(len(fwd), 9)
+        self.assertEqual(fwd[0], start)
+        self.assertEqual(fwd[-1], stop)
+        # Test the same, but in reverse
+        rev = list(croniter_range(stop, start, '0 0 * * *'))
+        self.assertEqual(len(rev), 9)
+        # Ensure forward/reverse are a mirror image
+        rev.reverse()
+        self.assertEqual(fwd, rev)
+
+    def test_1day_step_no_ends(self):
+        # Test without ends (exclusive)
+        start = datetime(2016, 12, 2)
+        stop = datetime(2016, 12, 10)
+        fwd = list(croniter_range(start, stop, '0 0 * * *', exclude_ends=True))
+        self.assertEqual(len(fwd), 7)
+        self.assertNotEqual(fwd[0], start)
+        self.assertNotEqual(fwd[-1], stop)
+        # Test the same, but in reverse
+        rev = list(croniter_range(stop, start, '0 0 * * *', exclude_ends=True))
+        self.assertEqual(len(rev), 7)
+        self.assertNotEqual(fwd[0], stop)
+        self.assertNotEqual(fwd[-1], start)
+
+    def test_1month_step(self):
+        start = datetime(1982, 1, 1)
+        stop = datetime(1983, 12, 31)
+        res = list(croniter_range(start, stop, '0 0 1 * *'))
+        self.assertEqual(len(res), 24)
+        self.assertEqual(res[0], start)
+        self.assertEqual(res[5].day, 1)
+        self.assertEqual(res[-1], datetime(1983, 12, 1))
+
+    def test_1minute_step_float(self):
+        start = datetime(2000, 1, 1, 0, 0)
+        stop =  datetime(2000, 1, 1, 0, 1)
+        res = list(croniter_range(start, stop, '* * * * *', ret_type=float))
+        self.assertEqual(len(res), 2)
+        self.assertEqual(res[0], 946684800.0)
+        self.assertEqual(res[-1] - res[0], 60)
+
+    def test_auto_ret_type(self):
+        data = [
+            (datetime(2019, 1, 1), datetime(2020, 1, 1), datetime),
+            (1552252218.0, 1591823311.0, float),
+        ]
+        for start, stop, rtype in data:
+            ret = list(croniter_range(start, stop, "0 0 * * *"))
+            self.assertIsInstance(ret[0], rtype)
+
+    def test_input_type_exceptions(self):
+        dt_start1 = datetime(2019, 1, 1)
+        dt_stop1 = datetime(2020, 1, 1)
+        f_start1 = 1552252218.0
+        f_stop1 = 1591823311.0
+        # Mix start/stop types
+        with self.assertRaises(TypeError):
+            list(croniter_range(dt_start1, f_stop1, "0 * * * *"), ret_type=datetime)
+        with self.assertRaises(TypeError):
+            list(croniter_range(f_start1, dt_stop1, "0 * * * *"))
+
+    def test_timezone_dst(self):
+        """ Test across DST transition, which technially is a timzone change. """
+        tz = pytz.timezone("US/Eastern")
+        start = tz.localize(datetime(2020, 10, 30))
+        stop =  tz.localize(datetime(2020, 11, 10))
+        res = list(croniter_range(start, stop, '0 0 * * *'))
+        self.assertNotEqual(res[0].tzinfo, res[-1].tzinfo)
+        self.assertEqual(len(res), 12)
+
+    def test_extra_hour_day_prio(self):
+        def datetime_tz(*args, **kw):
+            """ Defined this in another branch.  single-use-version """
+            tzinfo = kw.pop("tzinfo")
+            return tzinfo.localize(datetime(*args))
+        tz = pytz.timezone("US/Eastern")
+        cron = "0 3 * * *"
+        start = datetime_tz(2020, 3, 7, tzinfo=tz)
+        end = datetime_tz(2020, 3, 11, tzinfo=tz)
+        ret = [ i.isoformat() for i in croniter_range(start, end, cron) ]
+        self.assertEqual(ret, [
+            "2020-03-07T03:00:00-05:00",
+            "2020-03-08T03:00:00-04:00",
+            "2020-03-09T03:00:00-04:00",
+            "2020-03-10T03:00:00-04:00"])
+
+    def test_issue_142_dow(self):
+        ret = []
+        for i in range(1, 31):
+            ret.append((i,
+                croniter('35 * 0-l/8 * *', datetime(2020, 1, i),
+                         ret_type=datetime).get_next())
+            )
+            i += 1
+        self.assertEqual(
+            ret,
+            [(1, datetime(2020, 1, 1, 0, 35)),
+             (2, datetime(2020, 1, 8, 0, 35)),
+             (3, datetime(2020, 1, 8, 0, 35)),
+             (4, datetime(2020, 1, 8, 0, 35)),
+             (5, datetime(2020, 1, 8, 0, 35)),
+             (6, datetime(2020, 1, 8, 0, 35)),
+             (7, datetime(2020, 1, 8, 0, 35)),
+             (8, datetime(2020, 1, 8, 0, 35)),
+             (9, datetime(2020, 1, 16, 0, 35)),
+             (10, datetime(2020, 1, 16, 0, 35)),
+             (11, datetime(2020, 1, 16, 0, 35)),
+             (12, datetime(2020, 1, 16, 0, 35)),
+             (13, datetime(2020, 1, 16, 0, 35)),
+             (14, datetime(2020, 1, 16, 0, 35)),
+             (15, datetime(2020, 1, 16, 0, 35)),
+             (16, datetime(2020, 1, 16, 0, 35)),
+             (17, datetime(2020, 1, 24, 0, 35)),
+             (18, datetime(2020, 1, 24, 0, 35)),
+             (19, datetime(2020, 1, 24, 0, 35)),
+             (20, datetime(2020, 1, 24, 0, 35)),
+             (21, datetime(2020, 1, 24, 0, 35)),
+             (22, datetime(2020, 1, 24, 0, 35)),
+             (23, datetime(2020, 1, 24, 0, 35)),
+             (24, datetime(2020, 1, 24, 0, 35)),
+             (25, datetime(2020, 2, 1, 0, 35)),
+             (26, datetime(2020, 2, 1, 0, 35)),
+             (27, datetime(2020, 2, 1, 0, 35)),
+             (28, datetime(2020, 2, 1, 0, 35)),
+             (29, datetime(2020, 2, 1, 0, 35)),
+             (30, datetime(2020, 2, 1, 0, 35))])
+
+    def test_issue145_getnext(self):
+        # Example of quarterly event cron schedule
+        start = datetime(2020, 9, 24)
+        cron = "0 13 8 1,4,7,10 wed"
+        with self.assertRaises(CroniterBadDateError):
+            it = croniter(cron, start, day_or=False, max_years_between_matches=1)
+            it.get_next()
+        # New functionality (0.3.35) allowing croniter to find spare matches of cron patterns across multiple years
+        it = croniter(cron, start, day_or=False, max_years_between_matches=5)
+        self.assertEqual(it.get_next(datetime), datetime(2025, 1, 8, 13))
+
+    def test_issue145_range(self):
+        cron = "0 13 8 1,4,7,10 wed"
+        matches = list(croniter_range(datetime(2020, 1, 1), datetime(2020, 12, 31), cron, day_or=False))
+        self.assertEqual(len(matches), 3)
+        self.assertEqual(matches[0], datetime(2020, 1, 8, 13))
+        self.assertEqual(matches[1], datetime(2020, 4, 8, 13))
+        self.assertEqual(matches[2], datetime(2020, 7, 8, 13))
+
+        # No matches within this range; therefore expect empty list
+        matches = list(croniter_range(datetime(2020, 9, 30), datetime(2020, 10, 30), cron, day_or=False))
+        self.assertEqual(len(matches), 0)
+
+    def test_croniter_range_derived_class(self):
+        # trivial example extending croniter
+
+        class croniter_nosec(croniter):
+            """ Like croniter, but it forbids second-level cron expressions. """
+            @classmethod
+            def expand(cls, expr_format):
+                if len(expr_format.split()) == 6:
+                    raise CroniterBadCronError("Expected 'min hour day mon dow'")
+                return croniter.expand(expr_format)
+
+        cron = "0 13 8 1,4,7,10 wed"
+        matches = list(croniter_range(datetime(2020, 1, 1), datetime(2020, 12, 31), cron, day_or=False, _croniter=croniter_nosec))
+        self.assertEqual(len(matches), 3)
+
+        cron = "0 1 8 1,15,L wed 15,45"
+        with self.assertRaises(CroniterBadCronError):
+            # Should fail using the custom class that forbids the seconds expression
+            croniter_nosec(cron)
+
+        with self.assertRaises(CroniterBadCronError):
+            # Should similiarly fail because it's using the custom classs too
+            i = croniter_range(datetime(2020, 1, 1), datetime(2020, 12, 31), cron, _croniter=croniter_nosec)
+            next(i)
+
+    def test_explicit_year_forward(self):
+        start = datetime(2020, 9, 24)
+        cron = "0 13 8 1,4,7,10 wed"
+
+        # Expect exception because no explict range was provided.  Therefore, the caller should be made aware that an implicit limit was hit.
+        ccron = croniter(cron, start, day_or=False)
+        ccron._max_years_between_matches = 1
+        iterable = ccron.all_next()
+        with self.assertRaises(CroniterBadDateError):
+            next(iterable)
+
+        iterable = croniter(cron, start, day_or=False, max_years_between_matches=5).all_next(datetime)
+        n = next(iterable)
+        self.assertEqual(n, datetime(2025, 1, 8, 13))
+
+        # If the explictly given lookahead isn't enough to reach the next date, that's fine.  The caller specified the maximum gap, so no just stop iteration
+        iterable = croniter(cron, start, day_or=False, max_years_between_matches=2).all_next(datetime)
+        with self.assertRaises(StopIteration):
+            next(iterable)
+
+    def test_explicit_year_reverse(self):
+        start = datetime(2025, 1, 1)
+        cron = "0 13 8 1,4,7,10 wed"
+
+        ccron = croniter(cron, start, day_or=False)
+        ccron._max_years_between_matches = 1
+        iterable = ccron.all_prev()
+        with self.assertRaises(CroniterBadDateError):
+            next(iterable)
+
+        iterable = croniter(cron, start, day_or=False, max_years_between_matches=5).all_prev(datetime)
+        n = next(iterable)
+        self.assertEqual(n, datetime(2020, 7, 8, 13))
+
+        iterable = croniter(cron, start, day_or=False, max_years_between_matches=2).all_prev()
+        with self.assertRaises(StopIteration):
+            next(iterable)
+
+    def test_issue151(self):
+        """."""
+        self.assertTrue(
+            croniter.match("* * * * *", datetime(2019, 1, 14, 11, 0, 59, 999999)))
+
+    def test_overflow(self):
+        """."""
+        self.assertRaises(CroniterBadCronError, croniter , "0-10000000 * * * *", datetime.now())
+
+    def test_issue156(self):
+        """."""
+        dt = croniter("* * * * *,0", datetime(2019, 1, 14, 11, 0, 59, 999999)).get_next()
+        self.assertEqual(1547463660.0, dt)
+        self.assertRaises(CroniterBadCronError, croniter, "* * * * *,b")
+        dt = croniter("0 0 * * *,sat#3", datetime(2019, 1, 14, 11, 0, 59, 999999)).get_next()
+        self.assertEqual(1547856000.0, dt)
+
+    def test_confirm_sort(self):
+        m, h, d, mon, dow, s = range(6)
+        self.assertListEqual(croniter('0 8,22,10,23 0 0 0').expanded[h], [8, 10, 22, 23])
+        self.assertListEqual(croniter('0 0 25-L 0 0').expanded[d], [25, 26, 27, 28, 29, 30, 31])
+        self.assertListEqual(croniter("1 1 7,14,21,L * *").expanded[d], [7, 14, 21, "l"])
+        self.assertListEqual(croniter("0 0 * * *,sat#3").expanded[dow], ["*", 6])
+
+
+if __name__ == '__main__':
+    unittest.main()