What is a Unix Timestamp?
A Unix timestamp (also known as Epoch time, POSIX time, or Unix time) is a system for describing points in time as the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC. This moment is known as the "Unix Epoch." The timestamp is a simple integer that increases by one every second, making it a universal and timezone-independent way to represent time in computing.
How to Use This Converter
- Select Input Type - Choose whether you're converting from a timestamp or a date/time.
- Enter Value - Input your timestamp (e.g., 1702656000) or date string (e.g., 2023-12-15 12:00:00).
- Choose Unit - Select seconds, milliseconds, or auto-detect for timestamps.
- Click Convert - Press the button to see the converted result in multiple formats.
- Copy Results - Click the copy icon next to any value to copy it to your clipboard.
Seconds vs Milliseconds
Seconds (10 digits)
Traditional Unix timestamp. Example: 1702656000 represents Dec 15, 2023.
Milliseconds (13 digits)
Used by JavaScript and many APIs. Example: 1702656000000 (same date with ms precision).
Why Use Unix Timestamps?
- Timezone Independence - Same value worldwide, no timezone confusion.
- Easy Calculations - Simple arithmetic for time differences.
- Database Storage - Efficient integer storage vs string dates.
- API Communication - Standard format for data exchange.
- Sorting - Natural chronological ordering as numbers.
FAQ
What is the Year 2038 problem?
32-bit systems store timestamps as signed integers that will overflow on January 19, 2038. Modern 64-bit systems don't have this limitation.
How do I know if a timestamp is in seconds or milliseconds?
Count the digits: 10 digits = seconds, 13 digits = milliseconds. Our converter auto-detects this for you.
Can timestamps be negative?
Yes, negative timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969.