Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps Free, browser-based, no sign-up required.
What is Timestamp Converter?
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. It is widely used in programming, databases, APIs, and log files as a universal time representation that is independent of time zones. This tool converts between Unix timestamps and human-readable date formats, auto-detecting whether your input is in seconds or milliseconds.
How to Use
Enter a Unix timestamp (in seconds or milliseconds) to see it converted into multiple date formats including ISO 8601, RFC 2822, local time, and relative time. Alternatively, pick or type a date to get the corresponding Unix timestamp. The live clock at the top shows the current time updating every second. Click any copy button to copy a value to your clipboard.
How It Works
The converter uses JavaScript's built-in Date object and Intl APIs for all conversions. Timestamps above 10^12 are automatically treated as milliseconds; smaller values are treated as seconds. Relative time is calculated by comparing the input against the current system time. All processing happens client-side in your browser.
Common Use Cases
- Converting API response timestamps to readable dates for debugging
- Generating Unix timestamps for database queries and cron jobs
- Debugging log file timestamps across different time zones
- Converting between epoch time and ISO 8601 for API requests
- Checking relative time differences between events
- Verifying token expiration times in JWT and OAuth flows
Frequently Asked Questions
What is the difference between seconds and milliseconds timestamps?▼
A Unix timestamp in seconds is a 10-digit number (e.g., 1705312200), while milliseconds is 13 digits (e.g., 1705312200000). Many programming languages like JavaScript use milliseconds, while others like Python default to seconds. This tool auto-detects the format.
What is the Unix epoch?▼
The Unix epoch is January 1, 1970, 00:00:00 UTC. All Unix timestamps are measured as the number of seconds (or milliseconds) elapsed since this reference point. Dates before the epoch have negative timestamps.
Does this tool handle time zones?▼
Yes. The tool displays both UTC and your local time zone. Your browser's timezone is auto-detected and shown alongside the UTC offset. All conversions account for timezone differences.
Can I enter negative timestamps?▼
Yes. Negative timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969 in UTC.
Does this tool send my data to a server?▼
No. All conversions happen entirely in your browser using JavaScript's Date API. No data is transmitted to any server.