Unix Timestamp Converter
What date is this Unix timestamp — or what timestamp is this date?
Spec sheet
unix_epoch · v1.0.0Seconds since 1970-01-01T00:00:00Z (POSIX time)
- 01
date = 1970-01-01T00:00:00Z + t seconds - 02
13-digit values are treated as milliseconds - 03
leap seconds are not counted (POSIX)
- Dates without a time zone are read as UTC.
- Range ±8.64 × 10¹⁵ ms (JavaScript Date).
- POSIX.1 — Seconds Since the Epochstandard
Worked example
computed by the same formula1700000000
- Timestamp or date
- 1700000000
- ISO 8601 (UTC)
- 2023-11-14T22:13:20.000Z
- Unix seconds
- 1700000000
- Unix milliseconds
- 1700000000000
- Day of week (UTC)
- Tuesday
Questions
How is the unix timestamp calculated?
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Seconds since 1970-01-01T00:00:00Z (POSIX time). date = 1970-01-01T00:00:00Z + t seconds · 13-digit values are treated as milliseconds · leap seconds are not counted (POSIX)
Example: 1700000000?
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ISO 8601 (UTC): 2023-11-14T22:13:20.000Z; unix seconds: 1700000000.
What does this calculator not cover?
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Dates without a time zone are read as UTC. Range ±8.64 × 10¹⁵ ms (JavaScript Date).
Where do the numbers come from?
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Sources: POSIX.1 — Seconds Since the Epoch. The formula is versioned (unix_epoch v1.0.0) and covered by automated tests.
Is my data stored?
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No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.
Also searched asunix timestamp converter · epoch to date · date to unix timestamp · epoch converter · convert timestamp to date