How do I subtract minutes from a date in javascript?

Question

How can I translate this pseudo code into working js [don\'t worry about where the end date comes from except that it\'s a valid javascript date].

var myEndD         


        

Answer 1

Once you know this:

• You can create a Date by calling the constructor with milliseconds since Jan 1, 1970.
• The valueOf() a Date is the number of milliseconds since Jan 1, 1970
• There are 60,000 milliseconds in a minute :-]

...it isn't so hard.

In the code below, a new Date is created by subtracting the appropriate number of milliseconds from myEndDateTime:

var MS_PER_MINUTE = 60000;
var myStartDate = new Date(myEndDateTime - durationInMinutes * MS_PER_MINUTE);