Question 1

What is a Unix timestamp?

Accepted Answer

A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 00:00:00 UTC (the epoch). It is the standard way to represent time in programming.

Question 2

How does it detect seconds vs milliseconds?

Accepted Answer

If the value is greater than 10^12, it is treated as milliseconds; otherwise as seconds. This auto-detection works correctly in most cases.

Question 3

What is ISO 8601 format?

Accepted Answer

ISO 8601 is the international standard for date/time notation, like "2024-01-15T09:30:00.000Z". It is widely used in API communication.

Question 4

Can I convert negative timestamps?

Accepted Answer

Yes, negative timestamps represent dates before 1970 and are converted correctly.

🕐 Timestamp Converter

Unix Timestamp → Date

Date → Unix Timestamp

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