Hi all

I would like to ask you about date calculation.

There are two input widgets, 'Joining Date' and 'Contract End Date' for employee management system. When I enter the date of joining, I want the 'contract end date' to be reflected automatically.

By the way, the date is selected with date picker.

The calculation is different for temporary employees and part-timers. For temporary employees is 4 months, at the end of the month. 
Part-timers are determined by the company's employees. 
ex. joining date: Jun 1st end date: August 31st

What should I do with these definitions?

I tried the following, but it doesn't work.

===
var employeeType: Employee[] = {  
{id:0 name:temporary};  {id:1 name:PartTime};
};

var startDate = $('.calender hasdatapicker').datapicker('getDate')
var expireDate= dt.setMonth(dt.getMonth() + 3);
this.options.form.getWidgetByName("name").setValue(expireDate);

=== 

Regards,

Asami