Timestamp Converter
What a Unix timestamp is
A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since midnight UTC on 1 January 1970 — a compact, time-zone-free way for computers to record a moment. Ten-digit numbers are usually seconds; thirteen-digit numbers are milliseconds. This tool converts that number into a date you can read, and converts any date back into the timestamp.
UTC, local time, and ISO 8601
The same instant looks different depending on the time zone, so every result is shown in both UTC and your device’s local time, along with the unambiguous ISO 8601 form. That makes it easy to line up a server log stored in UTC with what actually happened in your part of the world.
Who uses it and how it stays private
Developers reach for timestamp conversion constantly — debugging logs, reading database fields, testing APIs, and setting expiry times. This tool does all of it locally using your browser’s own clock and time zone, so nothing you enter is uploaded.
Frequently asked questions
What is a Unix timestamp?
It is the number of seconds (or milliseconds) since 1 January 1970 UTC — a compact, timezone-free way computers store a moment in time. This tool converts it to and from a readable date.
Seconds or milliseconds?
Both. Toggle the unit and the tool interprets your input and produces output accordingly — 10-digit timestamps are usually seconds, 13-digit are milliseconds.
Does it show my local time zone?
Yes. Every timestamp is shown in both UTC and your device’s local time, plus the ISO 8601 form, so there is no ambiguity.
Is anything sent to a server?
No. It uses your device’s own clock and time zone, entirely in your browser.