Time Zone Date Formatter
Format an RFC 3339 timestamp in an IANA time zone such as Europe/Paris.
Try a worked example
Try a worked example
How to use this
Enter a timestamp with Z or a UTC offset and an IANA zone. Calculate to display that same instant in the zone.
A local time without Z or an offset is ambiguous. Zone rules depend on the browser’s time-zone data.
Example input
2024-02-29T12:00:00Z → Europe/Paris
Expected result
2024-02-29 13:00 Europe/Paris
2024-02-29T12:00:00Z appears as 13:00 in Europe/Paris on that date. The instant has not changed.
More detail
Daylight-saving changes can skip or repeat clock times. Formatting changes the displayed clock, not the instant.
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Quick answer
Format an unambiguous timestamp in a named IANA time zone.
The page and its assets load from the site; this operation uses your entered values only in this browser and does not send them to a calculation endpoint.
How to use it
Enter a date and time in RFC 3339 form, including Z or a numeric UTC offset, then enter an IANA time-zone name such as Europe/Paris. The result formats that same instant in the selected zone.
Limits
The timestamp must include Z or a numeric UTC offset and supports up to millisecond precision. Results use the browser’s time-zone data, which may differ between browsers or be updated at different times.
Frequently asked questions
Why does the timestamp need Z or an offset?
The suffix identifies the timestamp’s offset from UTC, so it represents one instant consistently across devices.
Does the selected zone change the instant?
No. The timestamp identifies the instant; the IANA time zone changes how that instant is displayed.
Sources and references
These references document the cited standard or browser API; they do not validate the tool’s output.