timezoneOffsetMinutes property
Current UTC offset in minutes.
Positive values are east of UTC, negative values are west. Examples: -300 (EST), -240 (EDT), 330 (IST), 545 (Nepal).
This value is denormalized for efficient Firestore queries. It MUST be refreshed when DST transitions occur, even if timezone remains unchanged.
Implementation
final int timezoneOffsetMinutes;