Adding days to a date in a loop, javascript

Question

I feel like there is something I'm missing about this, I'm trying to add 7 days to a current date, then 14, then 21. What I'm ending up with is a compounding of intervals rather than current date + 7, then current date + 14 etc.

var date = new Date();

for(var i = 0; i < 4; i++){
                var tempDate = date;
                var repeatson = tempDate.setDate(date.getDate() + (i*7));
                var repeats = new Date(repeatson);
                console.log(repeats);
                }

Results in:

"2015-03-17T21:03:13.326Z"
"2015-03-24T21:03:13.326Z"
"2015-04-07T20:03:13.326Z"
"2015-04-28T20:03:13.326Z"

Rather than the desired, 24th, 31st & 8th

Felix Kling · Accepted Answer · 2015-03-17 21:20:18Z

3

var tempDate = date; simply assigns a reference to date. You are not creating a copy. Similarly, setDate does not return a new date, it mutates the date itself.

One solution would be to create a copy:

var tempDate = new Date(date);

Your loop could be simplified to

var repeats = (new Date(date)).setDate(date.getDate() + (i*7))

answered Mar 17, 2015 at 21:20

Felix Kling

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