Timestamp converter
Unix time, ISO, RFC 2822 and local time from one field.
Questions
What does this tool do?
The Timestamp converter takes a moment in whatever form you have it — Unix seconds or milliseconds, an ISO 8601 date, an RFC 2822 date, or the word now — and writes it every other way: seconds, milliseconds, ISO in UTC and in your zone, RFC 2822, your local time in words, and how far from now it is. Every line has its own Copy.
Which formats does it read?
ISO 8601 (2026-09-13, 2026-09-13T12:00:00Z, 2026-09-13 12:00+03:00), RFC 2822 (Sun, 13 Sep 2026 12:00:00 +0000), Unix seconds and milliseconds, negative numbers for moments before 1970, the word now, and whatever else your browser can read, such as March 5, 2026.
How does it tell seconds from milliseconds?
By its size. A number below 100 000 000 000 is read as seconds (that limit is the year 5138); anything larger is milliseconds (100 000 000 000 ms is 1973). Paste 1700000000 and 1700000000000 and both land in November 2023.
What zone is a date without one?
A bare date like 2026-09-13 is midnight UTC; a date with a time but no zone, like 2026-09-13T12:00, is your local time. Add Z or an offset to say which you mean.
What is the year 2038?
The moment a 32-bit Unix clock runs out: 2147483647 seconds is 19 January 2038, 03:14:07 UTC, and one second later such a clock wraps to 1901. The converter itself is not limited; paste 2147483648 and it shows 03:14:08.
What does the Relative line show?
The last line says how far the moment is from now — 3 days ago, in 2 hours, just now — measured when you last changed the field, so it does not drift while you read.