Unix Timestamp Converter
Convert Unix time to dates and back.
LocalYour data is processed locally in your browser and is not uploaded to Alphzen.
- Detected
- seconds
- Unix seconds
- 1788772258
- Unix milliseconds
- 1788772258000
- ISO 8601
- 2026-09-07T09:10:58.000Z
- UTC
- 2026-09-07 09:10:58 UTC
- Local
- 2026-09-07 09:10:58 GMT+00:00
How to use
- Paste Unix seconds (10 digits), milliseconds (13 digits), or an ISO 8601 date.
- Convert. Seconds vs milliseconds are inferred from magnitude.
- Use Now for the current instant.
- Copy the ISO, Unix seconds, or Unix milliseconds value you need.
Features
- Detects seconds vs milliseconds from the number’s size.
- Shows UTC, local time with offset, ISO 8601, and both Unix forms.
- Parses ISO dates via the JavaScript Date parser.
- Does not invent a timezone database beyond what the browser provides.
- Local processing only.
Examples
1717200000
Values with 13 or more digits, or magnitude ≥ 1e12, are treated as milliseconds.
FAQ
Seconds or milliseconds?
Unix time in APIs is usually seconds. JavaScript Date.now() is milliseconds. Alphzen treats |n| ≥ 1e12 (or 13+ digit integers) as milliseconds.
Which timezone is “local”?
Your browser’s current timezone. UTC is also shown so a teammate in another zone can compare.
Leap seconds?
JavaScript Date does not model leap seconds. Neither does this tool.
Related guides
Related tools
About this tool
A Unix timestamp is seconds (or milliseconds) since 1970-01-01T00:00:00Z. Logs, JWTs, and databases mix the two units. This converter makes the unit explicit.
ISO 8601 is the usual interchange form. Alphzen shows both so you can paste into a query or a config without guessing the epoch scale.
Scheduling is a different problem — use the Cron Expression Generator for recurring jobs.