javascript function to subtract date from current date consecutively for a year

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I want to find date by subtracting X number of days from a particular date in JavaScript. My JavaScript function accepts 2 parameters. One is the date value (yyyy-mm- dd) and the other is the number of days that needs to be subtracted.

I have subtract 30days consecutively for a year.

eg: 2014/12/30
2014/11/30
2014/10/30
2014/09/30
.....
.
.
.
.
.
2014/01/30

I have tried like this :

function statement_cycle(date,days)
{
return new Date(
date.getFullYear(),
date.getMonth(),
date.getDate() – days,
date.getHours(),
date.getMinutes(),
date.getSeconds(),
date .getMilliseconds()
);
}

i have calculated for the one month. i need to calculate for the remaining 11 months

Posted 2-Nov-14 20:20pm

priya dharshan

Updated 2-Nov-14 21:40pm

v2

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[no name] 3-Nov-14 2:26am

What is the issue ?

Maciej Los 3-Nov-14 3:05am

What have you done till now? Where are you stuck?

Maciej Los 3-Nov-14 3:38am

Use "Improve question" widget and post above code there.

Sinisa Hajnal 3-Nov-14 4:37am

What are you trying to do? If you need last day of the month (or current day in all months) you could generate the dates without subtraction.

priya dharshan 3-Nov-14 4:50am

based on the date from json text, i need to calculate the date (subtract the date from x days)for 12 consecutive months.

Sinisa Hajnal 3-Nov-14 6:19am

So if you get 2014-11-03 and x = 5 what should be your output? You didn't explain what you need to accomplish, but what you are trying to do. Those may be two different things, maybe there are different ways to do it which you didn't consider. Sooo...what are you trying to accomplish?

priya dharshan 3-Nov-14 6:32am

in my case, x should be always 30 or 31 or 29. ie no of days in a month

Sinisa Hajnal 3-Nov-14 6:42am

So, what you really need is list of last days of months in the given year?

priya dharshan 3-Nov-14 7:12am

yes

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Sinisa Hajnal · Answer 1 · 2014-11-03T02:46:00

Solution 1

Try this. 0 as day parameter will return last month day.

JavaScript

for (month=1; month <= 12; month++) {
    var lastDay = new Date(date.getFullYear(), month, 0);

    // do something with your last day
}

Posted 3-Nov-14 2:46am

Sinisa Hajnal