how to create a business rule for add days in a field date

[Lucas11]

Hey guys. I need to automatically calculate the contract end date.
I need to make a business rule where it takes the "Start date" field:

Add the days in the "Term of contract" field:

Where 1 year adds up to 365 days and 2 years adds up to 730 days.

And put the result in date format in the "End date" field:

Fields:

• Start date | starts
• End date | ends
• Contract term | u_contract_term

Table: 

• Contract | ast_contract

I don't even know where to start in scripting, I'm terrible at scripting.
I don't have anything yet.

Thank you so much ❤️

[Gunjan Kiratkar]

Hi @Lucas11 ,

You can try below code :- in BR

(function executeRule(current, previous /*null when async*/ ) {

    var StartDate = new GlideDateTime(current.starts);
    if (current.contract_term == '1_year') { //write down proper field name and backend value for 1 year
        StartDate.addDaysUTC(365);
    } else if (current.contract_term == '2_year') { //write down proper field name and backend value for 2 year
        StartDate.addDaysUTC(730);
    }
    current.ends = StartDate;
    current.update();
})(current, previous);