get epoch time code example

Example 1: get current time epoch javascript

var a = Date.now();

// Returns miliseconds since epoch

Example 2: epoch

Epoch timestamp is a unit of measurement for time. It is the number of
seconds elapsed since the countdown has started. 

Beginning epochs per system:
macOS - January 1, 1904
Windows - January 1, 1601
Unix - January 1, 1970