The computations are done based on extracting a local time value and changing the millisecond count for that, before storing it back again as a local time value.
The result of this method is the new time value having had the milliseconds component set according to the passed-in argument.
<HTML> <HEAD></HEAD> <BODY> <SCRIPT> myDate = new Date(); myDate.setMilliseconds(0); myTime = myDate.getTime(); document.write("The time rounded down to the nearest second is " + myTime + " Milliseconds"); </SCRIPT> </BODY> </HTML>
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