The seconds since 1970-01-01 00:00 UTC — ticking below, converted in both directions. Click the big number to copy it.
Both, auto-detected by magnitude: 10 digits is seconds, 13 is milliseconds, 16 is microseconds, 19 is nanoseconds. The detected unit is shown under the input so you can sanity-check.
A count of seconds since 1970-01-01 00:00:00 UTC (the “epoch”), ignoring leap seconds. It’s the timestamp format of nearly every log file, API and database you’ll meet.
Entirely in your browser. Dates you type are never sent anywhere — there is no server doing the math, no analytics watching you do it.