0ab5312bf1
When checking current shifts to trigger slack notifications, a stable value for timezone should be used (to avoid triggering multiple duplicated notifications; using the first `VTIMEZONE` value available may change on refresh, besides being potentially incorrect). Also, `VTIMEZONE` shouldn't be used as the calendar timezone, it just describes a [timezone definition](https://icalendar.org/iCalendar-RFC-5545/3-6-5-time-zone-component.html) which can later be [used when specifying a start/end date/datetime](https://icalendar.org/iCalendar-RFC-5545/3-2-19-time-zone-identifier.html) ("The parameter MUST be specified on properties with a DATE-TIME value if the DATE-TIME is not either a UTC or a "floating" time."). OTOH, Google uses the non-standard[ `X-WR-TIMEZONE` ](https://github.com/collective/icalendar/issues/343)field as fallback TZ for date-times without a `TZID`. Try to use this when available, otherwise fallback to `UTC`. |
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| .. | ||
| ical_events | ||
| migrations | ||
| models | ||
| tasks | ||
| tests | ||
| __init__.py | ||
| admin.py | ||
| constants.py | ||
| ical_utils.py | ||