Timestamp Converter
A Timestamp Converter translates between Unix epoch seconds or milliseconds, ISO 8601 strings, and human-readable date/time representations in any time zone, performed entirely client-side using the browser's Intl and Date APIs.
About Timestamp Converter
Enter a Unix timestamp (seconds or milliseconds) or a date string and see all common representations side-by-side: ISO 8601 UTC, ISO 8601 with offset, RFC 2822, Unix seconds, Unix milliseconds, and a long-form localized date. We auto-detect whether your input is in seconds or milliseconds.
What Timestamp Converter does
- Auto-detects seconds vs milliseconds based on input magnitude
- Side-by-side ISO 8601 UTC, ISO 8601 with offset, and RFC 2822 outputs
- Local time zone plus any IANA time zone you pick
- Quick presets (now, start of day, start of month)
- Built on Intl + Date APIs — no library round-trip
When to reach for Timestamp Converter
- Decoding a Unix timestamp out of a log line
- Generating an ISO 8601 string for an API request body
- Translating a UTC timestamp into the user's actual local time
- Spotting timezone bugs when an event fires at the wrong wall-clock time
How to use Timestamp Converter
- 01
Paste a timestamp or date
Enter a Unix timestamp (seconds or milliseconds) or a date string in any standard format.
- 02
Pick a time zone
Default is your local zone; pick any IANA zone (e.g. Asia/Tokyo) from the selector.
- 03
Copy the format you need
Each representation (Unix s, Unix ms, ISO 8601, RFC 2822, long-form local) has its own copy button.
When to use Timestamp Converter vs alternatives
| Alternative | Use Timestamp Converter when… | Use the alternative when… |
|---|---|---|
| `date -d @<ts>` in the terminal | you want every representation visible at once with timezone picker. | you are scripting and need a single format. |
| epochconverter.com | the timestamp is from production traffic or contains user identifiers you would rather not paste into a third-party service. | you specifically want a feature offered there that we do not have. |