Reproduce #217

src/icalendar/tests/test_timezoned.py

@@ -318,3 +318,13 @@ class TestTimezoneCreation(unittest.TestCase):
             ),
             tz._tzinfos.keys()
         )
+
+    def test_same_start_date(self):
+        """testing if we can handle VTIMEZONEs whose different components
+        have the same start DTIMEs."""
+        directory = os.path.dirname(__file__)
+        with open(os.path.join(directory, 'timezone_same_start.ics'), 'rb') as fp:
+            data = fp.read()
+        cal = icalendar.Calendar.from_ical(data)
+        d = cal.subcomponents[1]['DTSTART'].dt
+        self.assertEqual(d.strftime('%c'), 'Fri Feb 24 12:00:00 2017')

src/icalendar/tests/timezone_same_start.ics

@@ -0,0 +1,27 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:Microsoft Exchange Server 2010
+METHOD:REQUEST
+BEGIN:VTIMEZONE
+TZID:Pacific Standard Time
+BEGIN:STANDARD
+DTSTART:16010101T020000
+RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
+TZOFFSETFROM:-0700
+TZOFFSETTO:-0800
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:16010101T020000
+RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3
+TZOFFSETFROM:-0800
+TZOFFSETTO:-0700
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+SUMMARY;LANGUAGE=en-US:Test 4
+DTSTART;TZID="Pacific Standard Time":20170224T120000
+DTEND;TZID="Pacific Standard Time":20170224T123000
+DTSTAMP:20170224T180431Z
+UID:040000008200E00074C5B7101A82E0080000000090E19664858ED20100000000000000
+END:VEVENT
+END:VCALENDAR