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, known as the Unix epoch. It is timezone-independent.

Question 2

What is the difference between seconds and milliseconds timestamps?

Accepted Answer

Unix timestamps in seconds are 10 digits (e.g., 1745000000). Millisecond timestamps are 13 digits (e.g., 1745000000000). JavaScript's Date.now() returns milliseconds.

Question 3

When does Unix time overflow?

Accepted Answer

32-bit Unix timestamps overflow on January 19, 2038 (the Year 2038 problem). Modern systems use 64-bit timestamps which won't overflow for billions of years.

Unix Timestamp Converter — Epoch to Date

Timestamp → Date

Date → Timestamp

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