How python iCalendar, iso8601 and pytz can work together for ICS implementation

tz_examples.py

import icalendar
import pytz

ev = icalendar.Event()
ev.add('dtstart', iso8601.parse_date("2016-01-01 00:00:00", default_timezone=pytz.timezone("Asia/Tokyo")))
print(ev.to_ical())

# BEGIN:VEVENT
# DTSTART;TZID=Asia/Tokyo;VALUE=DATE-TIME:20160101T000000
# END:VEVENT

ev = icalendar.Event()
ev.add('dtstart', iso8601.parse_date("2016-01-01 00:00:00+09:00", default_timezone=None))
print ev.to_ical()

# BEGIN:VEVENT
# DTSTART;TZID="+09:00";VALUE=DATE-TIME:20160101T000000
# END:VEVENT