Current Unix Timestamp
Seconds since January 1, 1970 00:00:00 UTC
Supports both seconds and milliseconds
Unix Timestamp Converter for Developers
Unix timestamps (also called Epoch time or POSIX time) represent time as a single number counting seconds since January 1, 1970. Our converter helps developers and analysts work with these timestamps quickly.
What Is Unix Epoch Time?
The Unix epoch is the date and time from which Unix timestamps are measured: January 1, 1970, at 00:00:00 UTC. Every timestamp is simply the number of seconds (or milliseconds) that have passed since that moment.
For example, the timestamp 1718460000 represents June 15, 2024, at 14:00:00 UTC. This compact representation makes timestamps ideal for storing, sorting, and calculating time differences in software systems.
Why Use Unix Timestamps?
- Consistency - No timezone ambiguity; always represents the same moment
- Compact storage - A single integer is smaller than date strings
- Easy comparison - Simple arithmetic compares times (larger = later)
- Universal support - Every programming language handles epoch time
- No formatting issues - Avoid date format confusion (MM/DD vs DD/MM)
Common Uses
- Database timestamps for record creation and modification
- API responses and request logging
- JWT token expiration times
- Cache invalidation and TTL calculations
- Event scheduling and cron job configuration
Seconds vs Milliseconds
Unix timestamps traditionally use seconds, but JavaScript and many modern APIs use milliseconds. A timestamp like 1718460000 is in seconds (10 digits), while 1718460000000 is in milliseconds (13 digits). Our converter automatically detects and handles both formats.
What is the Year 2038 problem?
Systems storing timestamps as 32-bit signed integers will overflow on January 19, 2038. The maximum value (2,147,483,647) represents 03:14:07 UTC on that date. Modern systems use 64-bit integers to avoid this issue.
How do I get the current timestamp in code?
In JavaScript: Date.now() (milliseconds) or Math.floor(Date.now()/1000) (seconds). In Python: import time; time.time(). In PHP: time(). Most languages have similar built-in functions.
Can timestamps be negative?
Yes, negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969 (one day before the epoch). Most systems handle negative timestamps correctly.
Why do some APIs return 13-digit timestamps?
Thirteen-digit timestamps are in milliseconds rather than seconds. JavaScript Date.now() returns milliseconds. Divide by 1000 to convert to standard Unix seconds, or multiply a seconds timestamp by 1000 for JavaScript compatibility.