TIMESTAMP

Milliseconds to Date

Enter a Unix timestamp in milliseconds and get a readable date that keeps the millisecond fraction.

Milliseconds since the epoch

Many platforms count in milliseconds rather than seconds: JavaScript's Date.now(), Java's System.currentTimeMillis(), and many JSON APIs. A millisecond timestamp has 13 digits today, for example 1790000000123, and the last three digits are the fraction of a second.

Why milliseconds matter

Milliseconds let you order events that happen within the same second and measure latency. This page keeps the millisecond fraction in every result, so 1790000000123 shows .123 instead of rounding it away.

Want the background? Read our comprehensive guide: Seconds vs Milliseconds Timestamps.

How to use this tool

Enter the timestamp in milliseconds.
Select Convert.
Read the date in UTC, your local time, ISO 8601 and a long readable format.
Copy the value you need.

Examples

The millisecond fraction is kept in the result.

A value from Date.now()

1790000000123 (milliseconds)

UTC: 2026-09-21 14:13:20.123 UTC
ISO 8601: 2026-09-21T14:13:20.123Z

A whole-second value

1700000000000 (milliseconds)

UTC: 2023-11-14 22:13:20.000 UTC
ISO 8601: 2023-11-14T22:13:20.000Z

Less than one second after the epoch

999 (milliseconds)

UTC: 1970-01-01 00:00:00.999 UTC
ISO 8601: 1970-01-01T00:00:00.999Z

Other pages would auto-detect 999 as seconds. This tool always reads milliseconds.

Frequently Asked Questions

How do I convert milliseconds to a date in JavaScript?

The Date constructor accepts milliseconds directly. For example new Date(1790000000123).toISOString() returns a UTC string that includes the milliseconds.

What if my number has 10 digits?

Ten digits means the value is in seconds. Use the Unix Timestamp Converter, which detects the unit, or multiply the number by 1,000 first.

Can I enter microseconds or nanoseconds?

Not directly. Divide microseconds by 1,000 or nanoseconds by 1,000,000 to get milliseconds first.

Are the milliseconds rounded?

Whole milliseconds are shown exactly. A fraction of a millisecond, such as 1790000000123.6, is rounded to the nearest whole millisecond.