Date Converter Online
Convert Unix, ISO, UTC, RFC and Excel date formats instantly
Convert date and time formats online, including Unix timestamps, ISO 8601, UTC, RFC and Excel date/time.
Unix Timestamp(ms)
Convert date and time formats in one place
This date converter helps you parse and transform date values across common technical formats. Paste one format and instantly get matching values for Unix timestamps, ISO standards, UTC strings, RFC formats and Excel date serials.
Key features
- Convert between Unix timestamps in seconds and milliseconds.
- Support ISO 8601, ISO 9075, RFC 3339, RFC 7231 and UTC formats.
- Generate and parse Excel date/time serial values.
- Auto-detect common input formats to reduce manual switching.
Use cases
- Debugging API payloads and backend logs with mixed time formats.
- Converting timestamps for frontend displays and reports.
- Validating date values when integrating third-party systems.
- Handling spreadsheet date values during data migration.
Frequently Asked Questions
Which date formats does this tool support?
It supports Unix timestamps (s/ms), ISO 8601, ISO 9075, RFC 3339, RFC 7231, UTC strings and Excel date/time values.
Can it detect the input format automatically?
Yes. The converter can detect several common date formats and switch to the matching parser automatically.
Why does converted time look different from expected?
Timezone and locale settings can change how time is displayed. Make sure the source format and timezone assumptions are correct.
Is this date converter free to use?
Yes. It is free and requires no signup.