Dynamically change the year when calculating date ranges using javascript

Question

I have this simple code to determine if the current date is part of the Fiscal Year 2014 or not. It sets a range between October 1, 2013 to September 30, 2014. Any date in that range will be considered Fiscal Year 2014:

var FYFirst     = 2013,
    FYLast      = 2014,
    beginningFY = new Date(FYFirst,9,1), //October 1
    endFY       = new Date(FYLast,8,30), //September 30
    todayDate   = new Date();
if (todayDate > beginningFY && todayDate < endFY ) { alert("FY 2014"); }
else { alert("Not this FY"); }

I would like to dynamically change FYFirst and FYLast. The way I wrote it, every October I would have to come and change it manually. I would appreciate any new ideas. thanks!

Wayne · Accepted Answer · 2013-12-30 20:08:10Z

3

All you need to do to get the starting year is to go back one from the current year whenever the current month is earlier in the year than October:

var todayDate = new Date();
var FYFirst = todayDate.getFullYear(); 
if (todayDate.getMonth() < 9) {
    FYFirst -= 1;
}
var FYLast = FYFirst + 1;

If it's after October, then the starting year is the current year. You can also do this in one line, but I'm not sure I'd advise it:

var FYFirst = todayDate.getFullYear() - (todayDate.getMonth() < 9);

edited Dec 30, 2013 at 20:08

answered Dec 30, 2013 at 19:46

Wayne

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1 Comment

cubanGuy Over a year ago

Thanks to lwburk, Yogesh and Jeremy for your suggestions, they all answer my question one way or another. At the end I decided to go with lwburk suggestions witha small modification:

var todayDate = new Date(), FYFirst = todayDate.getFullYear();  if (todayDate.getMonth() > 9){FYFirst += 1;} var FYLast = FYFirst - 1;

Thanks!

Yogesh · Accepted Answer · 2013-12-30 19:47:34Z

1

This will get you the current Fiscal year.

var today = new Date();
var currentYear = today.getFullYear();
var currentMonth = today.getMonth();
var FYFirst, FYLast;
if(currentMonth < 9)
{
    FYFirst = currentYear-1;
    FYLast = currentYear;
}
else
{
    FYFirst = currentYear;
    FYLast = currentYear + 1;
}
console.log(FYFirst);

jsfiddle

answered Dec 30, 2013 at 19:47

Yogesh

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Comments

user1932079 · Accepted Answer · 2013-12-30 19:44:21Z

0

I believe this will do what you need for any arbitrary year:

var todayDate = new Date(),
    FYFirst,
    FYLast,
    beginningFY,
    endFY;
if (todayDate.getMonth() < 9) {
    FYFirst = todayDate.getFullYear()-1;
} else {
    FYFirst = todayDate.getFullYear();
}
FYLast = FYFirst + 1;
beginningFY = new Date(FYFirst,9,1); //October 1
endFY = new Date(FYLast,8,30); //September 30
if (todayDate > beginningFY && todayDate < endFY ){
    alert("FY " + FYFirst);
} else {
    alert("Not this FY");
}

answered Dec 30, 2013 at 19:44

user1932079

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