Time Zone Calculator
Free online time zone calculator. Convert a date and time from one time zone to multiple destinations worldwide.
How to Use the Time Zone Calculator
Select your source time zone and enter a date and time. Then select one or more destination time zones to see the converted time. Use the quick-select buttons to add popular time zones.
About This Tool
Convert any date and time between time zones worldwide. Select a source zone, enter your time, and see it converted to multiple destinations at once. Uses the IANA time zone database via the browser’s Intl API for accurate conversions including daylight saving time. Essential for scheduling international meetings and coordinating remote teams. See the Date Calculator for date arithmetic.
Quick Reference Table
| Time Zone | UTC Offset (Standard) |
|---|---|
| US Eastern (ET) | UTC−5 |
| US Central (CT) | UTC−6 |
| US Mountain (MT) | UTC−7 |
| US Pacific (PT) | UTC−8 |
| London (GMT/BST) | UTC+0 |
| Central Europe (CET) | UTC+1 |
| India (IST) | UTC+5:30 |
| Japan (JST) | UTC+9 |
| Sydney (AEST) | UTC+10 |
Frequently Asked Questions
Does this account for daylight saving time?
Yes. The calculator uses the Intl API which automatically applies DST rules for each time zone based on the date you enter.
How many time zones can I convert to at once?
You can select as many destination time zones as you want. Each shows the converted time simultaneously.
Is this accurate for historical dates?
The calculator is most accurate for modern dates. Historical time zone data may vary, especially for dates before standardized time zones were adopted.