Question 1

What is a Unix timestamp?

Accepted Answer

The number of seconds elapsed since January 1, 1970 00:00:00 UTC (the Unix epoch). It is used universally in programming for date and time representation.

Question 2

Why do some timestamps have 10 digits and others 13?

Accepted Answer

10-digit timestamps are in seconds; 13-digit timestamps are in milliseconds. JavaScript's Date.now() returns milliseconds.

Question 3

What is the Year 2038 problem?

Accepted Answer

32-bit systems store Unix timestamps as signed integers, which max out on January 19, 2038. 64-bit systems are not affected.

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