Free online Unix timestamp converter. Convert timestamps to dates and vice versa. Supports seconds and milliseconds with auto-detection. Displays local time, UTC, ISO 8601, RFC 2822 formats. Pure frontend, no server uploads. | No Signup, Client-Side · No Server Uploads
Zero Dependencies·Works OfflineUnix Timestamp Converter - Seconds/Milliseconds
The Unix timestamp is the most widely used time representation in computer science, defined as the number of seconds since January 1, 1970 00:00:00 UTC. This tool provides fast and accurate conversion between Unix timestamps and human-readable dates, with automatic detection of second and millisecond precision.
Why use a timestamp converter?
In API development, database queries, log analysis, and more, Unix timestamps are everywhere. Developers frequently need to convert timestamps to readable formats for debugging, or convert dates to timestamps for programming.
Features
- Auto-detects 10-digit seconds and 13-digit milliseconds
- Displays local time, UTC, ISO 8601, and RFC 2822 formats simultaneously
- Supports reverse conversion from datetime picker to Unix timestamp
- Real-time current Unix timestamp display
- Pure frontend computation, no server uploads
FAQ
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 00:00:00 UTC, excluding leap seconds. It is widely used in computer systems.
How to distinguish seconds from milliseconds?
This tool auto-detects: 10-digit numbers are seconds, 13-digit numbers are milliseconds. Current Unix seconds are around 1.7 billion.
What time formats are supported?
Local time, UTC, ISO 8601 (e.g. 2024-03-18T00:00:00.000Z), RFC 2822 (e.g. Mon, 18 Mar 2024 00:00:00 GMT), relative time, and more.
Is my data uploaded to a server?
No. All timestamp conversions are performed locally in your browser. No data is ever uploaded to any server.
What timezone is used for date-to-timestamp conversion?
The datetime-local picker uses your local timezone. The resulting timestamp is a UTC Unix timestamp.