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diff --git a/_test/test_datetime.py b/_test/test_datetime.py
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+++ b/_test/test_datetime.py
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+# coding: utf-8
+
+"""
+http://yaml.org/type/timestamp.html specifies the regexp to use
+for datetime.date and datetime.datetime construction. Date is simple
+but datetime can have 'T' or 't' as well as 'Z' or a timezone offset (in
+hours and minutes). This information was originally used to create
+a UTC datetime and then discarded
+
+examples from the above:
+
+canonical:        2001-12-15T02:59:43.1Z
+valid iso8601:    2001-12-14t21:59:43.10-05:00
+space separated:  2001-12-14 21:59:43.10 -5
+no time zone (Z): 2001-12-15 2:59:43.10
+date (00:00:00Z): 2002-12-14
+
+Please note that a fraction can only be included if not equal to 0
+
+"""
+
+import pytest    # NOQA
+import ruamel.yaml   # NOQA
+
+from roundtrip import round_trip, dedent, round_trip_load, round_trip_dump  # NOQA
+
+
+class TestDateTime:
+    def test_date_only(self):
+        round_trip("""
+        - 2011-10-02
+        """, """
+        - 2011-10-02
+        """)
+
+    def test_zero_fraction(self):
+        round_trip("""
+        - 2011-10-02 16:45:00.0
+        """, """
+        - 2011-10-02 16:45:00
+        """)
+
+    def test_long_fraction(self):
+        round_trip("""
+        - 2011-10-02 16:45:00.1234      # expand with zeros
+        - 2011-10-02 16:45:00.123456
+        - 2011-10-02 16:45:00.12345612  # round to microseconds
+        - 2011-10-02 16:45:00.1234565   # round up
+        - 2011-10-02 16:45:00.12345678  # round up
+        """, """
+        - 2011-10-02 16:45:00.123400    # expand with zeros
+        - 2011-10-02 16:45:00.123456
+        - 2011-10-02 16:45:00.123456    # round to microseconds
+        - 2011-10-02 16:45:00.123457    # round up
+        - 2011-10-02 16:45:00.123457    # round up
+        """)
+
+    def test_canonical(self):
+        round_trip("""
+        - 2011-10-02T16:45:00.1Z
+        """, """
+        - 2011-10-02T16:45:00.100000Z
+        """)
+
+    def test_spaced_timezone(self):
+        round_trip("""
+        - 2011-10-02T11:45:00 -5
+        """, """
+        - 2011-10-02T11:45:00-5
+        """)
+
+    def test_normal_timezone(self):
+        round_trip("""
+        - 2011-10-02T11:45:00-5
+        - 2011-10-02 11:45:00-5
+        - 2011-10-02T11:45:00-05:00
+        - 2011-10-02 11:45:00-05:00
+        """)
+
+    def test_no_timezone(self):
+        round_trip("""
+        - 2011-10-02 6:45:00
+        """, """
+        - 2011-10-02 06:45:00
+        """)
+
+    def test_explicit_T(self):
+        round_trip("""
+        - 2011-10-02T16:45:00
+        """, """
+        - 2011-10-02T16:45:00
+        """)
+
+    def test_explicit_t(self):  # to upper
+        round_trip("""
+        - 2011-10-02t16:45:00
+        """, """
+        - 2011-10-02T16:45:00
+        """)
+
+    def test_no_T_multi_space(self):
+        round_trip("""
+        - 2011-10-02   16:45:00
+        """, """
+        - 2011-10-02 16:45:00
+        """)
+
+    def test_iso(self):
+        round_trip("""
+        - 2011-10-02T15:45:00+01:00
+        """)
+
+    def test_zero_tz(self):
+        round_trip("""
+        - 2011-10-02T15:45:00+0
+        """)
+
+    def test_issue_45(self):
+        round_trip("""
+        dt: 2016-08-19T22:45:47Z
+        """)