Unix Timestamp Converter
Turn epoch seconds or milliseconds into readable dates, or convert any date back into a timestamp.
How Timestamp Converter works
Convert Unix timestamps to human-readable dates and back, in UTC and your local timezone. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.
That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.
Seconds, milliseconds and ISO strings
The field accepts a Unix timestamp in seconds, and also parses an ISO date string back into a timestamp. The output shows UTC and your local zone side by side, because a timestamp is always UTC and the confusion is always local.
Millisecond timestamps are ten times larger — 1,717,171,717 versus 1,717,171,717,000 — and a converter that guesses wrong lands in 1970 or in the year 50,000.
What 1970 has to do with it
Unix time counts seconds from 1 January 1970 00:00 UTC. Modern timestamps are around 1.7 billion, which is a useful sanity check: a value in the millions is 1970s, a value in the trillions is milliseconds.
Negative values are legitimate and mean dates before 1970.
| Value | Meaning |
|---|---|
| 1,717,171,717 | 2024 (seconds) |
| 1,717,171,717,000 | The same moment in ms |
| 0 | 1 Jan 1970 |
| −86,400 | 31 Dec 1969 |
Where the off-by-hours comes from
A timestamp is an instant; a date is a convention. Two systems can show the same timestamp as different dates if one is in Karachi and the other in UTC, and both are right. When a log disagrees with a dashboard by a few hours, check the zone before suspecting the data.
Good to know
- Works offline once loaded, including on flights and in locked-down networks.
- No file size limit beyond your device's own memory.
- Free to use, with no account and no usage counter.
- Results are produced locally, so they are not logged or shared with anyone.
Questions
Does it handle milliseconds?
Yes — it detects 10-digit seconds and 13-digit millisecond timestamps automatically, and lets you switch.
Which timezones are shown?
UTC, your browser's local timezone, and the raw ISO 8601 representation.
Does it handle time zones other than mine?
It shows UTC and your local zone; other zones need the time zone converter.
Are leap seconds counted?
No — Unix time ignores them, which is standard behaviour.
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