Unix Timestamp Converter: Convert Epoch Dates to Readable Formats
Epoch seconds and milliseconds to dates, both directions.
As seconds (likely)
Sun, 20 Sep 2026 12:44:58 GMT
As milliseconds
Wed, 21 Jan 1970 17:11:48 GMT
Local: Sun Sep 20 2026 12:44:58 GMT+0000 (Coordinated Universal Time)
Seconds
1789908298
Milliseconds
1789908298000
ISO UTC
2026-09-20T12:44:58.000Z
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About this tool
Unix time counts seconds since 1 January 1970 UTC. JavaScript, however, works in milliseconds — the single most common source of dates landing in 1970 or the year 55000.
Seconds vs milliseconds
A ten-digit number is seconds, thirteen digits is milliseconds. The converter auto-detects and shows both interpretations.
Timezones
Epoch values are always UTC. Local rendering depends on the viewer's timezone, so store UTC and format at the edge.
How to use Unix Timestamp Converter
- 1
Open Unix Timestamp Converter
Everything runs on this page — there is nothing to install and no account required to use the free features.
- 2
Add your input
Paste or enter your values in the panel above. The tool updates as you type, so you can iterate quickly.
- 3
Review the output
Check the result, copy it with one click, and adjust the options until it matches what your system expects.
- 4
Take it further
Use the developer & api tips below to make the result production-ready, then unlock the gated extras via the form above.
Best practices
- Work from a real payload, not a hand-typed sample — encoding bugs hide in whitespace and Unicode.
- Keep the transformation reproducible: script it in CI once you have confirmed the output here.
- Never paste live credentials, customer records or production tokens into any web tool you have not audited.
- Version the inputs and outputs you rely on so a teammate can reproduce the same result later.
Unix Timestamp Converter — Why it matters
Small integration details — an encoding, a claim, a header — are where most API bugs actually live, and they are expensive to find in production logs.
Getting them right in seconds keeps debugging sessions short and prevents malformed data from reaching downstream systems.
Related free & paid tools
| Tool name | Type | Key features | Link |
|---|---|---|---|
| EpochConverter | Free | Epoch ↔ date conversion with timezone table | Visit |
| Luxon | Free | Timezone-aware date library for JavaScript | Visit |
| date-fns | Free | Modular date formatting and parsing utilities | Visit |
Some links marked Offer are partner links. They cost you nothing extra and help keep these tools free.