How to calculate time zones
Convert via today's UTC offset for each zone
Worked example. Converted time: Sat, Nov 14, 6:30 AM.
Example inputs — Time (24-hour, e.g. 14:30): 14:30; From time zone: New York (ET); To time zone: Los Angeles (PT). Starting values are illustrative.
The destination is 3 hours behind today
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Time zones shift with daylight saving, so this uses today's actual offsets between the two zones.
Assumptions & limitations
- Uses today's date; offsets can differ on other dates due to daylight saving changes.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Does it handle daylight saving?
Yes — it uses the current offsets, which already include daylight saving where it applies today.