def arrow_date_to_iso(instant: Arrow) -> str:
# date-only for all day events
# set to utc, make iso, remove timezone
instant = arrow.get(instant.astimezone(tzutc)).format('YYYYMMDD')
return instant # no TZ for all days
def arrow_to_iso(instant: Arrow) -> str:
# set to utc, make iso, remove timezone
instant = arrow.get(instant.astimezone(tzutc)).format('YYYYMMDDTHHmmss')
return instant + 'Z'
