Question 1

How do I convert a Unix timestamp to a date?

Accepted Answer

Enter a value in the Unix seconds or milliseconds field, and the tool instantly fills in the matching ISO, local, and UTC date-time values. You can also start from the ISO or local date-time field to get the timestamp back.

Question 2

What is the difference between Unix seconds and Unix milliseconds?

Accepted Answer

Unix seconds count whole seconds since 1970-01-01 UTC, while milliseconds count thousandths of a second, so the millisecond value is 1000 times larger. JavaScript and many APIs use milliseconds, so pick the field that matches your source value.

Question 3

Why does the local time differ from the UTC time shown?

Accepted Answer

The local date-time is parsed and displayed using your device's time zone, while the UTC value is the same instant expressed without any offset. If they look different, that gap is simply your time zone offset, not a conversion error.

Question 4

Is this timestamp converter free and usable offline?

Accepted Answer

Yes, it is completely free with no account, sign-up, or limits. All conversions run in your browser, so once the page is loaded it keeps working without a network connection.

Question 5

Are the timestamps and dates I enter uploaded anywhere?

Accepted Answer

No. Every conversion between Unix seconds, milliseconds, ISO, local, and UTC happens locally on your device. The values you type are never sent to a server and there is no tracking.

Timestamp Converter

FAQ