Convert Unix time in milliseconds or seconds

Timestamps are often represented in Unix time for several key reasons:

Simplicity

Counts seconds since January 1, 1970, making it easy to understand and manipulate.

Provides a uniform time representation across systems, unaffected by time zones or calendar changes.

Widely supported in computing, ensuring compatibility across platforms.

Allows straightforward arithmetic operations for time differences.

Stores time as a single integer, conserving memory and computational resources.

Facilitates seamless data exchange between systems and languages.