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Showing content from https://webplatform.github.io/docs/javascript/Date/UTC below:

UTC · WebPlatform Docs

UTC Summary

Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.

Syntax

Date.UTC( year , month , day [ , hours [, minutes [, seconds [, ms ]]]])

year: Required. The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.
month: Required. The month as an integer between 0 and 11 (January to December).
day: Required. The date as an integer between 1 and 31.
hours: Optional. Must be supplied if minutes is supplied. An integer from 0 to 23 (midnight to 11pm) that specifies the hour.
minutes: Optional. Must be supplied if seconds is supplied. An integer from 0 to 59 that specifies the minutes.
seconds: Optional. Must be supplied if milliseconds is supplied. An integer from 0 to 59 that specifies the seconds.
ms: Optional. An integer from 0 to 999 that specifies the milliseconds.

Examples

The following example illustrates the use of the Date.UTC function.


  var MinMilli = 1000 * 60;
 var HrMilli = MinMilli * 60;
 var DyMilli = HrMilli * 24;

 var date = new Date("June 1, 1990");
 var year = date.getFullYear();
 var month = date.getMonth();
 var day = date.getDay();

 var newDay = new Date("January 16, 2020");
 var yeartoday = newDay.getUTCFullYear();
 var monthtoday = newDay.getUTCMonth();
 var dayofmonthtoday = newDay.getUTCDate();

 
 var t1 = Date.UTC(year, month - 1, day)
 var t2 = Date.UTC(yeartoday, monthtoday, dayofmonthtoday);

 
 var days = (t2 - t1) / DyMilli;

 document.write(days);

Remarks

The Date.UTC function returns the number of milliseconds between midnight, January 1, 1970 UTC and the supplied date. This return value can be used in the setTime method and in the Date object constructor. If the value of an argument is greater than its range, or is a negative number, other stored values are modified accordingly. For example, if you specify 150 seconds, JavaScript redefines that number as two minutes and 30 seconds.

The difference between the Date.UTC function and the Date object constructor that accepts a date is that the Date.UTC function assumes UTC, and the Date object constructor assumes local time.