Unix Timestamp Converter Online
Convert Unix timestamps to dates and back
How to Use Unix Timestamp Converter Online
- 1Use "Timestamp to Date" mode: enter a Unix timestamp (seconds or milliseconds) to see the date in multiple formats.
- 2Use "Date to Timestamp" mode: select a date and time to get the Unix timestamp.
- 3The current Unix timestamp is shown at the top, updating every second.
- 4Copy any value using the Copy button.
About Unix Timestamp Converter Online
Convert Unix timestamps to human-readable dates and vice versa — free and instant. The converter auto-detects whether your input is in seconds or milliseconds. View results in ISO 8601, UTC, local time and relative format (e.g., '3 hours ago'). A live clock shows the current Unix timestamp updating in real time.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC (known as the Unix epoch). It is widely used in programming to represent dates and times as a single number.
What is the difference between seconds and milliseconds?
Unix timestamps in seconds are 10 digits (e.g., 1700000000). Timestamps in milliseconds are 13 digits (e.g., 1700000000000). This tool auto-detects the format based on the number of digits.
What is the Year 2038 problem?
32-bit systems store Unix timestamps as a signed 32-bit integer, which overflows on January 19, 2038. Modern 64-bit systems are not affected. This tool uses JavaScript which handles timestamps beyond 2038.