Unix Timestamp Converter
Convert Unix seconds, milliseconds, microseconds or nanoseconds to calendar dates and back, in your selected zone.
Processed locally in your browserPreparing timestamp converter…
How to use Unix Timestamp Converter
- Paste a Unix timestamp and choose seconds, milliseconds, microseconds or nanoseconds. Auto detection uses digit count and can be wrong for old or unusual values.
- Select an IANA time zone or use UTC / My zone. Convert to UTC ISO time and the selected zone, with exact decimal timestamp values.
- For the reverse direction, enter a calendar date/time in the selected zone. Repeated or skipped DST times produce an error unless you explicitly select an earlier/later resolution.
Useful things to know
Unix time is based on the UTC epoch; zones change calendar display and interpretation of local date input, not the underlying instant. Decimal input is preserved to nanosecond resolution using integer arithmetic. Calendar fields support millisecond precision. Negative timestamps are accepted; exponent notation, leap-second notation and dates outside the Temporal range are rejected. Auto unit detection is heuristic, not validation. Time-zone history and future rules depend on browser/runtime data; Unix time does not count leap seconds. Expiry or scheduling decisions require application-specific validation.
Is Unix Timestamp Converter free, and how is my privacy handled?
Yes. Unix Timestamp Converter is free to use without registration. Tool inputs are processed in your browser rather than uploaded to our servers. Optional usage analytics follows your cookie preferences; it does not receive your files or tool inputs. Keep your browser updated and review results before sharing.