Seconds, not milliseconds
The tool handles classic Unix timestamps in seconds. JavaScript often represents time in milliseconds. If a converted date is far from what you expected, check which unit you entered.
Unix timestamp converter
A Unix timestamp counts seconds since 1 January 1970 at 00:00:00 UTC (excluding leap seconds).
Reviewed: 23 September 2026
No account required. Local tools keep your input in your browser.
Frequently asked questions
Does a Unix timestamp include a timezone?
No. It denotes an instant on the UTC timeline. The timezone only affects how that instant is displayed as a local date and time.
How can I tell seconds from milliseconds?
A modern timestamp in seconds typically has 10 digits, versus 13 for milliseconds. Divide a millisecond value by 1,000 before entering it as seconds.
Why does local time differ from UTC?
Your browser formats local time according to your device's timezone and daylight saving rules. UTC remains the same regardless of location.
Can I convert a local date back to a timestamp?
Yes. Enter a local date and time; your browser interprets it in the device's local timezone and converts it to a Unix timestamp.
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