Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to readable dates, or pick a date/time and get the Unix timestamp. Everything runs locally in your browser — your inputs are not uploaded to produce the result.

Values with 13+ digits are treated as milliseconds; shorter values as seconds. Your browser’s local timezone, plus an ISO UTC string for reference.

Conversion runs locally in your browser. Tweak the inputs above to compare options, then copy or note the result you need.

Unix time is seconds (10 digits nowadays) or milliseconds (13 digits) since 1970-01-01 UTC. This page guesses from length. Display is local plus an ISO UTC string so you can see both.

Leap seconds are not something you handle in everyday Unix time. Logs, APIs, and databases disagree about seconds vs ms — check the docs. Conversion stays in the browser.