JavaScript сегодня датируется в эпохе
const start = Date.now();
/*gives the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.*/
Alive Anteater
const start = Date.now();
/*gives the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.*/var someDate = new Date(dateString);
someDate = someDate.getTime();