new datetime/delta <-> seconds/days conversion function

2 files changed, 18 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 985f00a..c3044f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 ChangeLog for logilab.common
 ============================
+
+	--
+* date: new datetime/delta <-> seconds/days conversion function
+	
 2011-04-01  --  0.55.2
     * new function for password generation in shellutils
 
diff --git a/date.py b/date.py
index b52e5fe..0dbbf51 100644
--- a/date.py
+++ b/date.py
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with logilab-common.  If not, see <http://www.gnu.org/licenses/>.
 """Date manipulation helper functions."""
+from __future__ import division
 
 __docformat__ = "restructuredtext en"
 
@@ -307,3 +308,16 @@ def utcdatetime(dt):
 
 def utctime(dt):
     return (dt + dt.utcoffset() + dt.dst()).replace(tzinfo=None)
+
+def datetime_to_seconds(date):
+    """return the number of seconds since the begining of the day for that date
+    """
+    return date.second+60*date.minute + 3600*date.hour
+
+def timedelta_to_days(delta):
+    """return the time delta as a number of seconds"""
+    return delta.days + delta.seconds / (3600*24)
+
+def timedelta_to_seconds(delta):
+    """return the time delta as a fraction of days"""
+    return delta.days*(3600*24) + delta.seconds