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app/web_time.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+from datetime import date, datetime, time, timedelta, timezone
+from zoneinfo import ZoneInfo
+
+
+def local_date_range_to_utc(start: date, end: date, tz: ZoneInfo) -> tuple[datetime, datetime]:
+    local_start = datetime.combine(start, time.min, tzinfo=tz)
+    local_end = datetime.combine(end + timedelta(days=1), time.min, tzinfo=tz)
+    return (
+        local_start.astimezone(timezone.utc).replace(tzinfo=None),
+        local_end.astimezone(timezone.utc).replace(tzinfo=None),
+    )