Timestamp Converter

Paste a timestamp and the page works out the unit by length: 10 digits is seconds, 13 is milliseconds, 16 is microseconds, 19 is nanoseconds. You don't have to pick.

Out comes the local time (your browser's timezone, shown as UTC+X under the cards), the UTC time, and how far the moment is from now. Click any result to copy it.

Going the other way, pick a date or type one like 2026-01-01 12:00:00, and you get all four units back at once. The nanosecond value is computed with BigInt, so all 19 digits are real; a plain JavaScript number gives up around the 17th digit and you end up with a timestamp ending in a row of zeros.

The bar on top shows the current time ticking every second. Click the seconds or the milliseconds to copy.

A few things worth knowing

13 digits is what you meet most: Java, JavaScript's Date.now() and most APIs produce it. 10 digits comes from older systems. 16 or 19 digits means someone measured finer than milliseconds, probably a performance log.

If the converted date is off by decades, it is almost always a seconds/milliseconds mix-up. Guessing by length handles the usual cases, but a value with leading zeros like 0000012345 can be judged wrong, so glance at the date before trusting it.