Time Zone Converter
Convert local times between time zones.
What time is it somewhere else?
Converting a time applies the difference between the two zones' offsets on that date, including daylight saving where it applies.
Formula: Resolve the entered wall-clock time to an instant using its IANA zone, then format that same instant in the destination zone.
What this calculator does
Convert a dated local time between supported IANA time zones with date-specific daylight-saving offsets.
Use it to turn Date and local time, From time zone, To time zone, Time format into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this everyday calculation.
Inputs and what they mean
- Date and local time
- — datetime-local value.
- From time zone
- — choice value.
- To time zone
- — choice value.
- Time format
- — 12 or 24 hour value.
How to use it
- Enter the dates, times, or schedule details.
- Adjust the available options for your situation.
- Review and copy the instant result.
Formula
Resolve the entered wall-clock time to an instant using its IANA zone, then format that same instant in the destination zone.
Inputs used: Date and local time, From time zone, To time zone, Time format.
Edge handling: Date and local time is required.; Date and local time must use a valid calendar date..
Worked example
New York to London
- Start with Date and local time: 2026-07-15T09:00, From time zone: America/New_York, To time zone: Europe/London.
- Apply the method: Resolve the entered wall-clock time to an instant using its IANA zone, then format that same instant in the destination zone.
- Convert a local time while applying the correct date-specific offsets.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this time zone converter; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Common questions
What time is it somewhere else?
Converting a time applies the difference between the two zones' offsets on that date, including daylight saving where it applies. Check the formula, example, and limitations on this page before using the result for a real everyday decision.
Does this handle DST?
Yes. Date-specific IANA time-zone rules determine offsets.
Why can a local time be invalid?
Clocks can skip local times during the spring DST transition. Check the formula, example, and limitations on this page before using the result for a real everyday decision.
How do I use the Time Zone Converter?
Enter the required values for Date and local time, From time zone, To time zone, Time format. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Time Zone Converter use?
Resolve the entered wall-clock time to an instant using its IANA zone, then format that same instant in the destination zone. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Time Zone Converter be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Cite this page
Free Calculator. (n.d.). Time Zone Converter. https://freecalculator.tech/tools/time-zone-converter
"Time Zone Converter." Free Calculator, https://freecalculator.tech/tools/time-zone-converter.
Time Zone Converter — Free Calculator, https://freecalculator.tech/tools/time-zone-converter
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