Unix Timestamp Converter
Paste epoch seconds, milliseconds, or an ISO date. See UTC, your local zone, and a relative reading that ticks with this browser's clock.
Tool input stays in your browserDid you know · Systems
Linux load average counts runnable and uninterruptible tasks, so it is not a CPU percentage.
Seconds, milliseconds, or an ISO date — guessed from the number of digits.
Convert
you editEnter a timestamp or choose a local calendar time.
Seconds versus milliseconds
Unix time is seconds since 1970-01-01T00:00:00Z. JavaScript Date.now() is milliseconds, and some databases store microseconds. This tool counts digits: ten means seconds, thirteen milliseconds, sixteen microseconds, nineteen nanoseconds. Shorter numbers use the same cutoff as the JWT decoder — larger than 1e12 is treated as milliseconds so a mistaken Date.now() paste still lands in the right decade.
Non-numeric input goes through Date.parse, so ISO-8601, RFC 2822, and now all work. The local calendar field writes a datetime in this device's timezone and converts it to Unix seconds.
Why it is private
Parsing and formatting run as JavaScript inside this page. Open DevTools, switch to the Network tab, and convert a timestamp from an access-token exp claim: no request carries that value.
Unix timestamp FAQ
Unix timestamp converter, epoch to date, seconds vs milliseconds, ISO 8601, and date to Unix time.
What is a Unix timestamp converter?
A Unix timestamp converter turns seconds (or milliseconds) since 1970-01-01T00:00:00Z into a human date, and the reverse. This epoch converter shows UTC, local time, ISO 8601, and a relative reading that updates with this browser’s clock.
How do I convert Unix time to a date?
Paste a 10-digit seconds value or a 13-digit millisecond value. This Unix timestamp converter infers the unit from length (also 16-digit µs and 19-digit ns). You get ISO 8601, UTC, and local datetime in 12-hour or 24-hour form. Non-numeric input is parsed as a date string, including ISO and “now”.
Seconds or milliseconds — which is my timestamp?
Classic Unix time is 10 digits (seconds). JavaScript Date.now() is 13 digits (milliseconds). Below 10 digits, values larger than 1e12 are treated as milliseconds so a mistaken Date.now() paste still lands in the right decade.
How do I convert a date to Unix epoch?
Use the local calendar field or paste an ISO-8601 string. The tool writes Unix seconds (and shows milliseconds). Conversion uses this device’s timezone for the datetime-local input.
Is the epoch converter private?
Yes. Parsing and formatting run locally. Token exp claims pasted here are not uploaded.