Timestamp Converter

Unix timestamps in seconds (epoch seconds) count how many seconds have passed since January 1, 1970 UTC — they're typically 10 digits (e.g. 1711238400). JavaScript and many modern APIs use milliseconds instead, which gives a 13-digit number (e.g. 1711238400000). This converter auto-detects which you mean based on your selection, so you can convert either format.

ISO 8601 is the international standard for representing dates and times, for example 2024-03-24T00:00:00.000Z. The T separates the date from the time, and the Z at the end means UTC (Zulu time). Many APIs, databases, and programming languages use ISO 8601 as their default date format because it's unambiguous and sortable as a string.

Select the format that matches your input (e.g. ISO 8601 or Local DateTime), type or paste the date string, and the converter immediately shows the equivalent Unix timestamp in seconds and milliseconds along with all other formats.

RFC 2822 is the date format used in email headers, for example: Sun, 24 Mar 2024 00:00:00 +0000. It's also used in HTTP headers and RSS feeds. The format includes a day abbreviation, numeric date, 3-letter month, 4-digit year, time, and timezone offset.

A Unix timestamp always refers to the same absolute moment in time regardless of timezone — it's the number of seconds since the UTC epoch. When you display it as a human-readable date, you convert it to a specific timezone which shifts the hours (and sometimes the date). ISO 8601 with a Z suffix is always UTC, while 'Local DateTime' shows the time in your browser's timezone.