Calculating quarters between dates with JavaScript

The script you provided seems to have a couple of issues. Here are the problems and their respective solutions:

1. Invalid variable name: You are using a reserved keyword, "return," as a variable name. This will cause a syntax error. Change the variable name to something else, such as "returnDate."
   
   
2. Incorrect calculation: The formula for calculating the number of quarters between two dates is incorrect. Subtracting a constant value (0.0416666666666667) and multiplying the difference by 4 will not yield the desired result. Instead, you need to calculate the difference between the two dates and divide it by the number of milliseconds in a quarter.

Try this:

var depart = this.getField("estdeparture").value;

var returnDate = this.getField("estreturn").value;

var startDate = new Date(depart); var endDate = new Date(returnDate);

var differenceInMilliseconds = endDate - startDate;

var quarters = differenceInMilliseconds / (1000 * 60 * 60 * 24 * 30 * 3); // Assuming each quarter has 3 months

event.value = quarters;

The script calculates the difference in milliseconds between the two dates and divides it by the number of milliseconds in a quarter. The result will be the number of quarters between the dates, which will be assigned to event.value.