`Date.prototype.getTime()`

Returns the timestamp of a Date as milliseconds since the epoch.

Syntax

date.getTime()

number — Milliseconds since 1 January 1970 UTC, or `NaN` for an invalid date.

const d = new Date("2020-01-01T00:00:00Z");
console.log(d.getTime());

Output

1577836800000

const a = new Date(0);
console.log(a.getTime());

Output

- Equivalent to `date.valueOf()` and the numeric coercion of a date. - Subtract two `getTime()` results to get a duration in milliseconds.