class SchedulesModel(ndb.Model):
"""Stores scheduling data."""
Name = ndb.StringProperty(indexed=True, required=True)
Timezone = ndb.StringProperty(default='UTC',
choices=tz.get_all_timezones(),
required=True)
Schedule = ndb.JsonProperty(required=True)
def time_zones():
"""
Get all time zones.
:return: all time zone in the world wide world.
"""
return json.dumps({"Timezones": tz.get_all_timezones()})