add & subtract

[Glen Forister]

After a couple hours, I got to this.

function Age_Mo() {

	// Replace with your own code

	var today = record.getFieldValue('fld-04e68a0e6dac4e07b05701f6d441f646');
	
var purchased = record.getFieldValue('fld-68a95dfabc274628b44d6ee28cda71d8');

var duration = [today] - [purchased]

return duration
}

Age_Mo();

All I get for a result ii “NaN”. Obviously, I’m missing something.

What I want is the result is the difference between 2 dates in months.
I also in the next field I want the result in years.

• This topic was modified 1 year, 11 months ago by Brendan. Reason: Added back-ticks to format the code

[Brendan]

Hi Glen,

You would not use the square brackets around [today] and [purchased].

In JavaScript there’s a getMonth() function you can use on dates.

So your formula would be:

var duration = today.getMonth() - purchased.getMonth();

FYI, NaN stands for Not a Number

[Brendan]

Actually there’s more to it because that doesn’t take into consideration the year.

Try this function:

function monthDiff(d1, d2) {
    var months;
    months = (d2.getFullYear() - d1.getFullYear()) * 12;
    months -= d1.getMonth();
    months += d2.getMonth();
    return months <= 0 ? 0 : months;
}

So you would call with this code:

var duration = monthDiff(today, purchased);

I just googled it, so I haven’t tested it.

• This reply was modified 1 year, 11 months ago by Brendan.

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