Upload files to "backend/app"

backend/app/timeutil.py

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+from datetime import UTC, datetime
+
+# Every timestamp in the DB uses this exact format, so string comparison == chronological comparison.
+DB_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
+
+
+def utcnow() -> datetime:
+    return datetime.now(UTC).replace(microsecond=0)
+
+
+def to_db(dt: datetime) -> str:
+    return dt.astimezone(UTC).strftime(DB_FORMAT)