refactor: update all_day detection logic (#2601)

Instead of using a particular resolution on an object, which differs
between `datetime.date` and `datetime.datetime` objects, operate on
parent class of `datetime` and convert all `dt` to timezone-aware
`datetime` values.

This is also in accordance to the model field being a `DateTimeField`,
so we should always be passing the correctly-created object, instead of
a `datetime.date()`, raising `received a naive datetime` warnings.

Removes unused constants.

Signed-off-by: Mike Fiedler <[email protected]>
Co-authored-by: Ee Durbin <[email protected]>

Author: miketheman

events/importer.py

@@ -7,9 +7,6 @@
 from .models import EventLocation, Event, OccurringRule
 from .utils import extract_date_or_datetime
 
-DATE_RESOLUTION = timedelta(1)
-TIME_RESOLUTION = timedelta(0, 0, 1)
-
 logger = logging.getLogger(__name__)
 
 
@@ -31,10 +28,7 @@ def import_occurrence(self, event, event_data):
             dt_end = dt_start
 
         # Let's mark those occurrences as 'all-day'.
-        all_day = (
-            dt_start.resolution == DATE_RESOLUTION or
-            dt_end.resolution == DATE_RESOLUTION
-        )
+        all_day = dt_end - dt_start >= timedelta(days=1)
 
         defaults = {
             'dt_start': dt_start,

events/utils.py

@@ -21,7 +21,7 @@ def date_to_datetime(date, tzinfo=None):
 
 
 def extract_date_or_datetime(dt):
-    if isinstance(dt, datetime.datetime):
+    if isinstance(dt, datetime.date):
         return convert_dt_to_aware(dt)
     return dt