Unix Timestamp Converter

How to use it

1. 1Paste a timestamp to get the date, or switch direction to go the other way.
2. 2Leave the unit on automatic — ten digits is seconds, thirteen is milliseconds.
3. 3Override the unit only if your value is unusual, such as a historical date stored in seconds.
4. 4Read both the UTC and local rows: they are the same instant shown in two zones and can differ by a day.
5. 5Use the relative description underneath as a sanity check that you converted the right value.

Frequently asked questions

How do I tell whether a timestamp is in seconds or milliseconds?

By size. A present-day timestamp in seconds has ten digits; in milliseconds it has thirteen. This page detects it automatically and lets you override the choice.

Why does local time differ from UTC by a day?

They are the same instant rendered in different zones. An event at 22:13 UTC has already happened on the following day in Sri Lanka, which is five and a half hours ahead. Both readings are correct.

What is the year 2038 problem?

Timestamps stored as signed 32-bit integers run out of range on 19 January 2038 and wrap to a negative number, placing the date in 1901. Storing time in 64 bits avoids it entirely.

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