Subtracting dates to figure left over months on a form

Question

Have a form that I use for signing up contractors for a yearly program. While the yearly signup begins 3/31/xxxx, I may sign them up during the year and it is a prorated fee based off the difference of what date they signup before that 3/31/xxxx date. Also we deduct one extra month from the time period and that is their fee.

Example:

3/31/2021 - 9/10/2020 = 6 months - 1 month = 5 months

Both dates have a place on the form along with the final 5 months which shows as a number.

Looking for the code to do the math on my form. Tried some Java Code i know and it isn't working out.

Thank you for looking at this and any help you can contribute.

try67 · Accepted Answer

You can use this code as the custom calculation script of the months field. Adjust the names of the fields as needed in the first two lines, of course:

var s1 = this.getField("Text1").valueAsString;
var s2 = this.getField("Text2").valueAsString;
if (s1=="" || s2=="") event.value = "";
else {
	var d1 = util.scand("m/dd/yyyy", s1);
	var d2 = util.scand("m/dd/yyyy", s2);
	var diffInMonths = (d2.getMonth()-d1.getMonth());
	event.value = (diffInMonths-1);
}

JP_ECS · Answer

Works great. text 1 (3/31/2021) and text2 (9/14/2020) rounds up to October and the count is right. Is there anyway to limit the entry of text 2 so the user can't enter a date past or before text 1? In this case text 1 can only be (04/01/2020 thru 3/30/2021)?

Thank you for your help.

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