Unix Timestamp Converter - Epoch Time Tool
Convert between Unix timestamps and human-readable dates with live clock display, timezone toggle, and multiple format outputs.
What Is a Unix Timestamp Converter?
A Unix timestamp (also called epoch time) is the number of seconds since January 1, 1970 (UTC). This tool lets you convert Unix timestamps to human-readable dates and vice versa. It shows a live-updating current timestamp, automatically detects whether your input is in seconds or milliseconds, and outputs results in multiple formats including ISO 8601 and RFC 2822. Switch between UTC and your local timezone with one click.
How to Use the Unix Timestamp Converter
- View Live Timestamp — The current Unix timestamp updates every second at the top
- Timestamp to Date — Paste a Unix timestamp (seconds or milliseconds) and click Convert
- Date to Timestamp — Enter year, month, day, hour, minute, second and click Convert
- Toggle Timezone — Switch between UTC and Local time for either conversion
- Read Results — See Unix (seconds), Unix (milliseconds), ISO 8601, RFC 2822, date, time, and locale formats
Why Use This Unix Timestamp Tool?
- Live Clock — See the current Unix timestamp ticking in real time
- Auto Detection — Automatically determines if input is seconds or milliseconds
- Multiple Formats — Outputs ISO 8601, RFC 2822, locale, and separated date/time
- Timezone Support — Toggle between UTC and local timezone instantly
- Two-way Conversion — Convert timestamps to dates and dates to timestamps
- Privacy First — Everything runs in your browser with no server calls
FreeToolbox vs Other Timestamp Tools
| Feature | FreeToolbox | unixtimestamp.com | epochconverter.com |
|---|---|---|---|
| Browser-based | Yes | Yes | Yes |
| Live timestamp clock | Yes | Yes | Yes |
| Auto ms detection | Yes | No | No |
| Multiple output formats | 7 formats | 3 formats | 4 formats |
| UTC/Local toggle | Yes | Limited | Yes |
| Dark theme | Yes | No | No |
| No ads | Yes | No | No |
FAQ
What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It's a standard way to represent time in computing and is used across programming languages, databases, and APIs.
How does the tool detect seconds vs milliseconds?
If the input number is greater than 9,999,999,999 (roughly the year 2286 in seconds), it's treated as milliseconds. Otherwise it's treated as seconds. This covers all practical use cases.
What timezone is used by default?
The tool defaults to your browser's local timezone. Click the UTC button to switch to Coordinated Universal Time.
What is ISO 8601 format?
ISO 8601 is an international standard for date/time representation. It looks like 2026-04-02T12:30:00.000Z, where T separates date and time, and Z indicates UTC.
Can I convert negative timestamps?
Yes. Negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969.