Merge remote-tracking branch 'origin/malostik-bugfix-#6414-respecting-time-bounds' into devel

lib/mentat/stats/idea.py

@@ -1049,7 +1049,7 @@ def _round_datetime(datetime_, round_to, timezone = None, direction = None):
     else:
         epoch = timezone.localize(datetime.datetime(1970, 1, 1))
 
-    mod = (datetime_.astimezone(datetime.timezone.utc) - epoch) % round_to
+    mod = (datetime_.replace(tzinfo=datetime.timezone.utc) - epoch) % round_to
 
     if not mod:
         return datetime_