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.
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.
getTime()
None.
To offer protection against timing attacks and fingerprinting, the precision of new Date().getTime()
might get rounded depending on browser settings. In Firefox, the privacy.reduceTimerPrecision
preference is enabled by default and defaults to 2ms. You can also enable privacy.resistFingerprinting
, in which case the precision will be 100ms or the value of privacy.resistFingerprinting.reduceTimerPrecision.microseconds
, whichever is larger.
// reduced time precision (2ms) in Firefox 60 new Date().getTime(); // 1519211809934 // 1519211810362 // 1519211811670 // … // reduced time precision with `privacy.resistFingerprinting` enabled new Date().getTime(); // 1519129853500 // 1519129858900 // 1519129864400 // …
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 Web Performance API's high-resolution time feature, Performance.now()
can provide more reliable and precise measurements of elapsed time than Date.now()
.
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
getTime |
1 | 12 | 1 | 3 | 1 | 18 | 4 | 10.1 | 1 | 1.0 | 4.4 | 1.0 | 0.10.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime