Hi @shaik23
Please check inline comments explaining each line.
extendByYear(current); // calling the function defined below
function extendByYear(current){ // function defination
var nextDate = new GlideDateTime(current.valid_to); // crate variable (object) of type GlideDateTime and initialize it with value selected in valid_to field
nextDate.addYearsUTC(1); // addYearsUTC is methode of GlideDateTime class, it add one year to the Date set previously
current.valid_to = nextDate.getDate(); // set the updated date to the field valid_to, getDate() returns date part form Date and Time
current.update(); // update the current record
action.setRedirectURL(current); // redirect to same form after saving record.
}
You can learn more about GlideDateTime API on below official documentation page.
https://developer.servicenow.com/dev.do#!/reference/api/tokyo/server/no-namespace/c_APIRef#r_ScopedG...
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Thanks
Anil Lande
