Time Zone Calculator
Free online Time Zone Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Local Time = UTC + Offset. Difference = Offset_A - Offset_B. DST adds 1 hour. Example: EST (UTC-5) to JST (UTC+9) = +14 hours.
Example Calculations
Meeting Planning
Input: New York (EST) to London (GMT), 3PM EST
Result: 8:00 PM GMT (5 hours ahead)
Global Call
Input: Tokyo (JST) to Los Angeles (PST), 9AM JST
Result: 5:00 PM PST previous day (17 hours behind)
Flight Arrival
Input: Depart 10AM EST, fly 7 hours, arrive CET
Result: Arrive 11:00 PM CET (6 hours ahead + 7hr flight)
About This Calculator
Free online time zone calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our time zone calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
How do time zones work?
24 zones, each ~15 degrees longitude. Measured as UTC offsets. EST = UTC-5, CST = UTC-6.
Time difference between cities?
Find UTC offsets and calculate difference. NYC (UTC-5) and London (UTC+0) = 5 hours.
What is daylight saving time?
Clocks advance 1 hour in warmer months. US: 2nd Sunday March to 1st Sunday November.
Schedule meetings across zones?
Use a timezone converter to find overlapping hours. Rotate meeting times to share odd hours.
International Date Line?
Imaginary line at ~180 degrees where date changes. Westward adds a day, eastward subtracts.