.valueOf()
Returns the difference in milliseconds between the specified date and January 1, 1970 00:00:00 UTC.
Syntax
myDate.valueOf();
Example 1
Print the value of January, 1st, 1970 at 12:00:00 AM.
const date = new Date(1999, 00, 01, 0, 0, 0, 0);console.log(date);// Output: Fri Jan 01 1999 00:00:00 GMT-0800 (Pacific Standard Time)// Note: Timezone may varyconsole.log(date.valueOf());// Output: 915177600000