Unix Timestamps Explained - Convert Between Formats
Learn what Unix timestamps are, how they work, and how to convert between Unix time and human-readable dates.
What is a Unix Timestamp?
A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. This date is known as the Unix Epoch. For example, the timestamp 1700000000 represents November 14, 2023, at 22:13:20 UTC.
Why Use Unix Timestamps?
- Timezone-independent - A single number represents the same moment worldwide
- Easy to compare - Simple arithmetic determines which event happened first
- Database-friendly - Stored as integers, they sort and index efficiently
- Compact - 10 digits vs lengthy date strings
Converting Timestamps
Use our Unix Timestamp Converter to instantly convert between Unix timestamps and human-readable dates. It supports seconds, milliseconds, and shows results in your local timezone and UTC.
Timestamps in Programming
In JavaScript: Date.now() returns milliseconds. In Python: time.time() returns seconds with decimals. In SQL: UNIX_TIMESTAMP() in MySQL or EXTRACT(EPOCH FROM NOW()) in PostgreSQL.
The Year 2038 Problem
32-bit systems store timestamps as signed integers, maxing out at 2,147,483,647 (January 19, 2038). After this, the value overflows and wraps to a negative number. Most modern systems now use 64-bit timestamps, which won't overflow for 292 billion years.