fix: make a few datetime manipulations timezone-aware (#4755)

* fix: set tz when passing a date to timesince_days filter

* fix: fill in tz for a constructed datetime in idindex/index.py

* test: simplify double-negatives in test assertions

* test: fix I-D expiration test cases to be tz aware

* fix: use tz-aware comparisons for in_draft_expire_freeze method

* test: fix tz used for timesince_days filter test case

ietf/doc/expire.py

@@ -73,10 +73,10 @@ def in_draft_expire_freeze(when=None):
 
     d = meeting.get_second_cut_off()
     # for some reason, the old Perl code started at 9 am
-    second_cut_off = datetime.datetime.combine(d, datetime.time(9, 0))
+    second_cut_off = d.replace(hour=9, minute=0, second=0, microsecond=0)
 
     d = meeting.get_ietf_monday()
-    ietf_monday = datetime.datetime.combine(d, datetime.time(0, 0))
+    ietf_monday = datetime.datetime.combine(d, datetime.time(0, 0), tzinfo=meeting.tz())
 
     return second_cut_off <= when < ietf_monday
 

ietf/doc/templatetags/ietf_filters.py

@@ -5,6 +5,7 @@
 import datetime
 import re
 from urllib.parse import urljoin
+from zoneinfo import ZoneInfo
 
 from django import template
 from django.conf import settings
@@ -316,9 +317,18 @@ def underline(string):
 
 @register.filter(name='timesince_days')
 def timesince_days(date):
-    """Returns the number of days since 'date' (relative to now)"""
+    """Returns the number of days since 'date' (relative to now)
+
+    >>> timesince_days(timezone.now() - datetime.timedelta(days=2))
+    2
+
+    >>> tz = ZoneInfo(settings.TIME_ZONE)
+    >>> timesince_days(timezone.now().astimezone(tz).date() - datetime.timedelta(days=2))
+    2
+
+    """
     if date.__class__ is not datetime.datetime:
-        date = datetime.datetime(date.year, date.month, date.day)
+        date = datetime.datetime(date.year, date.month, date.day, tzinfo=ZoneInfo(settings.TIME_ZONE))
     delta = timezone.now() - date
     return delta.days
 

ietf/doc/tests_draft.py

@@ -644,11 +644,19 @@ class ExpireIDsTests(DraftFileMixin, TestCase):
         second_cut_off = meeting.get_second_cut_off()
         ietf_monday = meeting.get_ietf_monday()
 
-        self.assertTrue(not in_draft_expire_freeze(datetime.datetime.combine(second_cut_off - datetime.timedelta(days=7), datetime.time(0, 0, 0))))
+        self.assertFalse(in_draft_expire_freeze((second_cut_off - datetime.timedelta(days=7)).replace(hour=0, minute=0, second=0)))
-        self.assertTrue(not in_draft_expire_freeze(datetime.datetime.combine(second_cut_off, datetime.time(0, 0, 0))))
+        self.assertFalse(in_draft_expire_freeze(second_cut_off.replace(hour=0, minute=0, second=0)))
-        self.assertTrue(in_draft_expire_freeze(datetime.datetime.combine(second_cut_off + datetime.timedelta(days=7), datetime.time(0, 0, 0))))
+        self.assertTrue(in_draft_expire_freeze((second_cut_off + datetime.timedelta(days=7)).replace(hour=0, minute=0, second=0)))
-        self.assertTrue(in_draft_expire_freeze(datetime.datetime.combine(ietf_monday - datetime.timedelta(days=1), datetime.time(0, 0, 0))))
+        self.assertTrue(in_draft_expire_freeze(
-        self.assertTrue(not in_draft_expire_freeze(datetime.datetime.combine(ietf_monday, datetime.time(0, 0, 0))))
+            datetime.datetime.combine(
+                ietf_monday - datetime.timedelta(days=1),
+                datetime.time(0, 0, 0),
+                tzinfo=datetime.timezone.utc,
+            )
+        ))
+        self.assertFalse(in_draft_expire_freeze(
+            datetime.datetime.combine(ietf_monday, datetime.time(0, 0, 0), tzinfo=datetime.timezone.utc)
+        ))
         
     def test_warn_expirable_drafts(self):
         from ietf.doc.expire import get_soon_to_expire_drafts, send_expire_warning_for_draft

ietf/idindex/index.py

@@ -270,7 +270,7 @@ def active_drafts_index_by_group(extra_values=()):
     groups = [g for g in groups_dict.values() if hasattr(g, "active_drafts")]
     groups.sort(key=lambda g: g.acronym)
 
-    fallback_time = datetime.datetime(1950, 1, 1)
+    fallback_time = datetime.datetime(1950, 1, 1, tzinfo=datetime.timezone.utc)
     for g in groups:
         g.active_drafts.sort(key=lambda d: d.get("initial_rev_time", fallback_time))