Time Zone Converter
Compare and convert times across global time zones.
This time zone converter (or time zone calculator) shows what time it is in another zone right now, or converts a specific time from one zone to another for planning meetings or calls across regions. It handles the utc time difference for any two zones, including daylight saving time adjustments where applicable.
Select a source time zone and a target time zone, and the converter shows the corresponding local time instantly.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 3:00 PM EST (UTC-5) to CET (UTC+1) | 9:00 PM CET | Offset difference = (+1) − (−5) = 6 hours. 3:00 PM + 6 hours = 9:00 PM CET. |
| 9:00 AM PST (UTC-8) to IST (UTC+5:30) | 10:30 PM IST | Offset difference = (+5:30) − (−8:00) = 13 hours 30 minutes. 9:00 AM + 13h30m = 10:30 PM IST. |
How Time Zone Offsets Work
Every time zone is defined as an offset from Coordinated Universal Time (UTC) - for example, U.S. Eastern Time is UTC-5 (or UTC-4 during daylight saving). Converting between two zones means finding the difference between their UTC offsets and applying that difference to the source time. Standardized time zones were established in the late 19th century, largely driven by railway companies that needed a consistent way to schedule trains across regions that had previously each kept their own local solar time; the system was built around Greenwich Mean Time (now UTC) as the universal reference point every other zone's offset is measured against.
Daylight Saving Time Complicates Conversions
Many regions shift their clocks forward or back for daylight saving time during part of the year, but not all regions observe it, and those that do don't always switch on the same dates. This is why a time difference between two cities can actually change by an hour depending on the time of year, even though neither city's base time zone offset changed.
How to Use the Time Zone Converter
- Open the Time Zone Converter and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the time zone converter works.
Frequently Asked Questions
How do I convert time between different time zones?
Find each zone's offset from UTC, calculate the difference between the two offsets, then add or subtract that difference from the source time to get the target zone's local time.
What is UTC time difference?
It is the number of hours a time zone is ahead of or behind Coordinated Universal Time (UTC) - for example, U.S. Pacific Time is typically UTC-8 or UTC-7 depending on daylight saving.
Does this time zone calculator account for daylight saving time?
Yes, it adjusts for daylight saving time in regions that observe it, since the same two zones can have a different time difference depending on the time of year.
How do I use this time zone converter?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Time Zone Converter calculate?
Compare and convert times across global time zones. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this time zone use?
The formula is: Target time = Source time + (Target UTC offset − Source UTC offset). Every time zone is defined by its offset from UTC. Subtracting the source offset from the target offset gives the hour difference between the two zones, which is then added to the source time to find the corresponding target-zone time.
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Last updated: September 29, 2026.