How to use the Time Zone Calculator
The time zone calculator converts a date and time between two zones, including daylight saving.
Open the Time Zone Calculator →
What you need to enter
- Date
- Time
- From
- To
The formula
It finds the exact moment in the starting zone and shows it in the target zone using your browser's time zone data.
Worked example
Using the default values in the calculator:
- Date: 2026-10-13
- Time: 12:00
- From: New York
- To: London
| In Europe/London | Tuesday, October 13, 2026 at 5:00 PM |
| In America/New_York | Tuesday, October 13, 2026 at 12:00 PM |
| Difference | 5 hours |
Tips for better results
- Pick the nearest major city.
- Dates can change when converting.
Common mistakes to avoid
- Forgetting daylight saving changes.
- Choosing a zone with a similar name.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.