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Unix Timestamp Converter
Convert between Unix timestamps and readable dates.
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Basic
What it is & how to use it
Unix time counts seconds (or milliseconds) since 1970-01-01 UTC. APIs and logs often store events this way.
How to use the Unix Timestamp Converter
1) Paste a timestamp or pick a date.
2) Convert either direction.
3) Note seconds vs milliseconds.
4) Confirm timezone display expectations with your team.
Intermediate
Formula & worked example
Seconds since epoch ↔ UTC datetime.
Example: 0 → 1970-01-01T00:00:00Z.
If the number looks 13 digits, it is often milliseconds.
Advanced
Interpretation, edge cases & next steps
Mixing seconds and ms shifts dates by ~500x.
Advanced: be explicit about UTC vs local display; Y2038 matters on some 32-bit systems.
Frequently asked questions
Seconds or milliseconds?
Check digit length and your API docs.
Timezone?
Epoch is UTC; display zones are a UI choice.
Negative timestamps?
Pre-1970 instants — support varies by stack.
Leap seconds?
Most systems ignore leap seconds in Unix time.
Runs where?
In your browser.
Deep guide
Read the full guide
Longer teaching, worked scenarios and mistakes — then jump back into this tool with example numbers.