secondsToUtcOffset
Formats a UTC offset in total seconds as "UTC±HH:MM:SS" or "UTC±HH:MM" if seconds are zero. Example: 19800.secondsToUtcOffset() → "UTC+05:30"
Formats a UTC offset in total seconds as "UTC±HH:MM:SS" or "UTC±HH:MM" if seconds are zero. Example: 19800.secondsToUtcOffset() → "UTC+05:30"