Add simple tzinfo implementation to support times with timezones.

convertish/tests/test_util.py

@@ -0,0 +1,28 @@
+from datetime import time, timedelta
+import unittest
+
+from convertish.util import SimpleTZInfo
+
+
+class TestSimpleTZInfo(unittest.TestCase):
+
+    def test_utcoffset(self):
+        self.assertEquals(SimpleTZInfo(60).utcoffset(None), timedelta(minutes=60))
+        self.assertEquals(SimpleTZInfo(-60).utcoffset(None), timedelta(minutes=-60))
+
+    def test_dst(self):
+        tz = SimpleTZInfo(60)
+        self.assertEquals(tz.dst(None), timedelta())
+
+    def test_tzname(self):
+        self.assertEquals(SimpleTZInfo(0).tzname(None), "+00:00")
+        self.assertEquals(SimpleTZInfo(60).tzname(None), "+01:00")
+        self.assertEquals(SimpleTZInfo(90).tzname(None), "+01:30")
+        self.assertEquals(SimpleTZInfo(-60).tzname(None), "-01:00")
+        self.assertEquals(SimpleTZInfo(-90).tzname(None), "-01:30")
+
+    def test_affect(self):
+        self.assertEquals(time(1, 2, 3, 0, SimpleTZInfo(0)).isoformat(), '01:02:03+00:00')
+        self.assertEquals(time(1, 2, 3, 0, SimpleTZInfo(90)).isoformat(), '01:02:03+01:30')
+        self.assertEquals(time(1, 2, 3, 0, SimpleTZInfo(-90)).isoformat(), '01:02:03-01:30')
+

convertish/util.py

@@ -0,0 +1,30 @@
+"""
+General support and utility module.
+"""
+
+from datetime import timedelta, tzinfo
+
+
+class SimpleTZInfo(tzinfo):
+    """
+    Simple concrete datetime.tzinfo class that handles only
+    offset in minutes form UTC.
+    """
+
+    def __init__(self, minutes):
+        self.minutes = minutes
+
+    def utcoffset(self, dt):
+        return timedelta(minutes=self.minutes)
+
+    def dst(self, dt):
+        return timedelta()
+
+    def tzname(self, dt):
+        if self.minutes < 0:
+            sign = '-'
+            hours, minutes = divmod(-self.minutes, 60)
+        else:
+            sign = '+'
+            hours, minutes = divmod(self.minutes, 60)
+        return '%s%02d:%02d' % (sign, hours, minutes)