This calculator adds the difference between two UTC offsets to a source time, converting it into the corresponding clock time in the destination time zone.
Time Zone Calculator
Convert a time from one UTC offset to another.
What the Time Zone Calculator Covers
This calculator covers time zone conversions based on UTC offsets — converting a time in one zone to the equivalent clock time in another zone, using the fixed offset difference between them. This is useful for scheduling calls, meetings, or events across different time zones.
This calculator works from the UTC offsets you supply directly, giving you full control over the specific offset in effect for your dates, rather than guessing at a zone’s default.
How the Converted Time Is Calculated
Formula
Converted Time = Source Time + (Destination Offset − Source Offset)
Where:
- Source Time = the time in the original zone, in 24-hour decimal format
- Source Offset = the source zone’s UTC offset (e.g., UTC−5 for US Eastern Standard Time)
- Destination Offset = the destination zone’s UTC offset (e.g., UTC+1 for Central European Time)
Worked Example
2:00 PM (14.0) in US Eastern Standard Time (UTC−5), converting to Central European Time (UTC+1).
Converted Time = 14.0 + (1 − (−5)) = 14.0 + 6 = 20.0, which is 8:00 PM
2:00 PM Eastern Standard Time converts to 8:00 PM Central European Time, a 6-hour difference between the two offsets.
Why You Need the Exact Offset in Effect on Your Date
Many time zones observe daylight saving time on different dates (or not at all), which shifts their effective UTC offset for part of the year. A zone’s “standard” offset may not match its actual offset on your specific date, so always check the specific offset in effect for the date you’re converting rather than assuming a fixed year-round value.
Frequently Asked Questions
Does this calculator automatically account for daylight saving time?
No — you must enter the correct offset already in effect for your specific date in each zone. Since daylight saving rules and dates vary by region and can change over time, always verify the current offset rather than relying on a fixed assumption.
How do I find the correct UTC offset for a specific city and date?
Check a current, reliable time zone reference for that specific city and date, since offsets can shift due to daylight saving time transitions that occur on different dates in different regions.
What happens if the converted time crosses midnight?
A result past 24.0 or below 0.0 represents a time on the next or previous calendar day — for example, a result of 26.0 would correspond to 2:00 AM the following day in the destination zone.
Can I use this for zones with a half-hour or 45-minute offset?
Yes — enter the offset as a decimal, such as 5.5 for a zone that’s UTC+5:30, since not all time zones use whole-hour offsets from UTC.
How do I schedule a meeting across several time zones at once?
Convert your proposed time to each participant’s zone separately using their respective offsets, then compare the resulting local times to find a slot that works reasonably well for everyone involved.
