Unix Timestamp Converter
Processed in your browserConvert Unix timestamps to readable dates and dates back to epoch seconds or milliseconds.
What this tool does
Convert Unix timestamps to readable dates and dates back to epoch seconds or milliseconds.
Features
- Seconds and milliseconds
- Auto-detect unit
- ISO 8601, UTC, and local time
- Relative time
- Date to timestamp
How to convert a Unix timestamp
- Paste a Unix timestamp (10 digits for seconds, 13 for milliseconds).
- Leave the unit on Auto-detect or pick seconds or milliseconds.
- Click Convert to see ISO 8601, UTC, local time, and relative time.
- Switch to Date to timestamp to turn an ISO date back into epoch values.
Example: seconds to date
- Input
- 1700000000
- Result
- 2023-11-14T22:13:20.000Z Tue, 14 Nov 2023 22:13:20 GMT
Common uses
- Read created_at or exp values in API responses and logs.
- Check when a JWT expires.
- Generate a timestamp for a database query or test fixture.
Supported formats
- Unix seconds and milliseconds
- ISO 8601 dates
- RFC 2822 dates
Limits
- Years roughly −271,821 to 275,760 (JavaScript Date range)
Limitations
- Ambiguous formats like 03/04/2026 depend on browser parsing—use ISO 8601.
- Leap seconds are not represented (Unix time ignores them).
Privacy
Conversions run in your browser; nothing is sent to a server.
Frequently asked questions
Related guides
- How to Convert a Unix Timestamp to a Date (and Back)
How to convert a Unix timestamp to a readable date and back: seconds vs milliseconds, time zones, the 2038 problem, and copy-ready code for JS, Python, SQL, and bash.
- Free Developer Tools Online: JSON, JWT, Base64, URL, Timestamp & Regex
Free developer tools online that run in your browser: format JSON, decode JWTs, encode Base64 and URLs, convert Unix timestamps, and test JavaScript regex.
- How to Decode a JWT Safely
How to decode a JWT safely: inspect the header and payload locally in your browser, read exp and iat, and avoid the mistake of trusting unverified claims.
- JWT Header vs Payload vs Signature Explained
JWT header vs payload vs signature explained: what each segment contains, how Base64URL encoding and signing work, and why only the signature makes a token trustworthy.
You may also need
JWT Decoder
Decode JWT header and payload locally. Inspect claims—signature is not verified.
JSON Formatter & Validator
Format, validate, and minify JSON. Tree view with syntax error highlighting.
Regex Tester
Test JavaScript regular expressions with live match highlighting, capture groups, and flags.
Base64 Encoder / Decoder
Encode or decode text to Base64 with optional URL-safe output—all in your browser.
Browse the free developer toolkit for every related tool and guide.