Timestamp Converter
Convert between Unix timestamps and human-readable dates in multiple formats. Live clock with your local timezone. Everything runs in your browser.
Output in UTC, ISO 8601, RFC 2822, MySQL/SQL, Excel Serial formats. Live relative time counter. Auto-detects seconds and milliseconds.
Timestamp → Date
Date → Timestamp
How It Works
This timestamp converter processes everything in your browser — no data is sent to any server. Enter a timestamp or pick a date, and see the conversion instantly.
Unix Timestamp
A Unix timestamp is the number of seconds since January 1, 1970 00:00:00 UTC (the Unix epoch). It is the standard way computers represent time internally. The converter auto-detects whether you enter seconds (10 digits) or milliseconds (13 digits).
Output Formats
The converter outputs dates in 8 formats: UTC (universal time), Local (your timezone), ISO 8601 (international standard), RFC 2822 (email standard), MySQL/SQL (ready for database queries), Excel Serial (days since 1900-01-01 for spreadsheets), Milliseconds, and Relative time with live updating counter (e.g., "2 hr 15 min 30 sec ago").
Live Clock
Two live panels at the top show the current Unix timestamp and your local time (with timezone detection, including daylight saving time). Both update every second. Click either panel to copy its value. The Relative time field also updates live after conversion.
Privacy First
All conversion runs locally in your browser using JavaScript. No data is sent to any server — there are no requests, no cookies, and no tracking.
Frequently Asked Questions (FAQ)
Q: What is a Unix timestamp?
A: A Unix timestamp is the number of seconds since January 1, 1970 00:00:00 UTC. For example, timestamp 1700000000 corresponds to November 14, 2023. It is the standard way computers store and compare dates.
Q: What is the difference between seconds and milliseconds?
A: Timestamps in seconds are 10 digits. Millisecond timestamps are 13 digits. JavaScript and Java use milliseconds. Unix/Linux and Python typically use seconds. The converter auto-detects the format.
Q: Is my data stored on the server?
A: No. All conversion happens directly in your browser using JavaScript. Nothing is sent to any server.
Q: What date formats are supported?
A: The converter outputs UTC, Local time, ISO 8601, RFC 2822, MySQL/SQL datetime (ready for database queries), Excel Serial (for spreadsheets), Milliseconds, and live Relative time. The Date → Timestamp direction also shows Day of Year and Week number.
Q: What is the Year 2038 problem?
A: 32-bit systems store timestamps as a signed 32-bit integer, which overflows on January 19, 2038. Modern 64-bit systems and this converter are not affected.
Q: What timezone does the converter use?
A: Unix timestamps are always UTC. The converter shows both UTC and your local time based on your browser timezone.
Q: Can I convert negative timestamps?
A: Yes. Negative timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969.
Q: Is this tool free?
A: Yes, completely free with no registration required. Use it as many times as you need.