Timestamp to Date Converter
Convert UNIX timestamps to human-readable dates.
Timestamp Input
Result
Local Time
UTC
ISO 8601
Seconds
-Milliseconds
-Relative
-Timestamp to Date Converter
Converts a UNIX timestamp (seconds or milliseconds since the Unix epoch) into a human-readable date. It automatically detects whether the input is in seconds or milliseconds and displays the result in local time, UTC, ISO 8601, and relative format.
What is it used for?
- Log analysis: convert epoch timestamps from server logs, error reports, and monitoring tools into readable dates
- API debugging: understand date values returned by APIs as integers — quickly see what a numeric timestamp means
- Database inspection: read timestamp columns stored as integers in PostgreSQL, MySQL, or Redis
- JWT inspection: decode exp, iat, and nbf claims from JSON Web Tokens to verify token timing
- JavaScript debugging: convert Date.now() millisecond values to human-readable format
Step-by-Step Guide
- Enter or paste the numeric timestamp
- The tool auto-detects seconds vs milliseconds format
- View the converted date in multiple formats (local, UTC, ISO 8601)
- Check the relative time (e.g., '3 hours ago')
- Copy any format you need
How it works
Enter a numeric timestamp and the tool auto-detects whether it's in seconds (10 digits) or milliseconds (13 digits). It converts the value using JavaScript's Date constructor and displays multiple output formats. The live UNIX timestamp counter at the top updates every second for reference. Everything runs client-side.
Tips & Best Practices
- If the date looks wrong, check whether your timestamp is in seconds or milliseconds
- The tool shows both local time and UTC — useful for debugging timezone issues
- Use this alongside the JWT Decoder to quickly verify token expiration times
- Bookmark the current timestamp counter for quick reference during development
Frequently Asked Questions
What is a UNIX timestamp?
A UNIX timestamp (also called epoch time or POSIX time) is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It's used universally in programming because it's timezone-independent and easy to store as a single integer.
How does auto-detection of seconds vs milliseconds work?
Timestamps with 10 or fewer digits are treated as seconds. Timestamps with 13 digits are treated as milliseconds. Values between 10 and 13 digits are interpreted based on their magnitude relative to reasonable date ranges.
What happens in 2038?
The Year 2038 problem affects systems storing timestamps as 32-bit signed integers, which overflow on January 19, 2038. Modern systems use 64-bit integers. JavaScript uses 64-bit floats, supporting dates well beyond 2038.
Can I convert negative timestamps?
Yes. Negative timestamps represent dates before January 1, 1970 UTC. For example, -86400 corresponds to December 31, 1969.
Privacy & Security
This tool uses FFmpeg compiled to WebAssembly (WASM). The WASM binary (~25MB) is downloaded from a CDN on first use and cached by your browser. All file processing happens locally on your device - your files are never uploaded to any server. This makes it safe for sensitive, private, or confidential media files. Large files may take longer to process depending on your device's CPU and available memory.