Baseline Widely available
The getTime() method of Date instances returns the number of milliseconds for this date since the epoch, which is defined as the midnight at the beginning of January 1, 1970, UTC.
const moonLanding = new Date("July 20, 69 20:17:40 GMT+00:00");
// Milliseconds since Jan 1, 1970, 00:00:00.000 GMT
console.log(moonLanding.getTime());
// Expected output: -14182940000
None.
Return valueA number representing the timestamp, in milliseconds, of this date. Returns NaN if the date is invalid.
Date objects are fundamentally represented by a timestamp, and this method allows you to retrieve the timestamp. You can use this method to help assign a date and time to another Date object. This method is functionally equivalent to the valueOf() method.
Constructing a date object with the identical time value.
// Since month is zero based, birthday will be January 10, 1995
const birthday = new Date(1994, 12, 10);
const copy = new Date();
copy.setTime(birthday.getTime());
Subtracting two subsequent getTime() calls on newly generated Date objects, give the time span between these two calls. This can be used to calculate the executing time of some operations. See also Date.now() to prevent instantiating unnecessary Date objects.
let end, start;
start = new Date();
for (let i = 0; i < 1000; i++) {
Math.sqrt(i);
}
end = new Date();
console.log(`Operation took ${end.getTime() - start.getTime()} msec`);
Note: In browsers that support the Performance API's high-resolution time feature, Performance.now() can provide more reliable and precise measurements of elapsed time than Date.now().
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