Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, and negative timestamps. All processing happens in your browser.
Timestamp → Date
Date → Timestamp
How to Convert Timestamps
- 1
Enter Timestamp
Type a Unix timestamp (seconds or milliseconds) or click 'Now' for the current time.
- 2
View Conversions
See the timestamp in UTC, local time, ISO 8601, and relative format.
- 3
Reverse Convert
Use the date picker to convert a human-readable date back to a Unix timestamp.
- 4
Copy Values
Copy individual timestamp formats to your clipboard.
About Unix Timestamps
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 is the universal standard for representing time in computing, used in REST APIs, databases, logging systems, and JWT tokens. Because timestamps are simple integers, they are timezone-agnostic and easy to compare, sort, and store.
Timestamps come in two formats: seconds (10 digits, e.g., 1700000000) and milliseconds (13 digits, e.g., 1700000000000). JavaScript's Date.now() returns milliseconds, while Python's time.time() returns seconds. ToolPix's converter auto-detects the format and converts both ways — from timestamp to human-readable date in UTC, local time, and ISO 8601, and back.
Understanding timestamps is essential for debugging API responses, analyzing server logs, setting cache TTL values, configuring JWT lifetimes, and scheduling cron jobs. Negative timestamps represent dates before the 1970 epoch.
All conversions happen entirely in your browser using JavaScript's native Date object — no data is sent to any server. Whether you are a backend developer, frontend engineer, or DevOps engineer, this free online Unix timestamp converter gives you instant, private results.
Key Features
Common Use Cases
- •Convert API response timestamps to human-readable dates
- •Debug JWT token expiration times (iat, exp claims)
- •Set cache expiration and TTL values in seconds
- •Analyze server log timestamps
- •Convert between time zones using UTC as intermediate
Frequently Asked Questions
What is the difference between seconds and milliseconds timestamps?
Seconds timestamps are 10 digits (e.g., 1700000000) and count seconds since epoch. Milliseconds timestamps are 13 digits (e.g., 1700000000000) and are used by JavaScript's Date.now() and many APIs.
What is the Unix epoch?
The Unix epoch is January 1, 1970, 00:00:00 UTC. All Unix timestamps are measured relative to this moment. Timestamps before this date are negative.
Can I convert dates before 1970?
Yes. Negative timestamps represent dates before the epoch. For example, -86400 represents December 31, 1969.
What time zone are timestamps in?
Unix timestamps are always in UTC (Coordinated Universal Time). This tool shows both UTC and your local time zone for convenience.
Is this timestamp converter free to use?
Yes. ToolPix's timestamp converter is completely free with no usage limits, no registration required, and no ads interrupting your workflow.
Can I use this tool on mobile devices?
Yes. The converter is fully responsive and works on any modern mobile browser — iOS Safari, Chrome for Android, and others — so you can convert timestamps on the go.
How does this compare to using the command line?
CLI commands like 'date -d @1700000000' work but require remembering syntax. This tool gives you instant visual output in multiple formats (UTC, local, ISO 8601, relative) without typing a single command.
Do you store or transmit my timestamps?
No. All conversions happen entirely in your browser using JavaScript. No data is sent to any server, ensuring complete privacy.