Question 1

How do I know if a timestamp is in seconds or milliseconds?

Accepted Answer

10-digit timestamps are in seconds (1,700,000,000 = 2023). 13-digit timestamps are in milliseconds (1,700,000,000,000 = 2023). A simple check: if the timestamp is > 1,500,000,000,000 it is milliseconds.

Question 2

What is the Y2038 (Year 2038) problem?

Accepted Answer

32-bit signed integers can store a maximum of 2,147,483,647 — which corresponds to January 19, 2038 03:14:07 UTC. Systems using 32-bit timestamps will overflow on this date. Modern 64-bit systems are not affected.

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