Google Apps Script: Retrieve Date from Spreadsheet and write to Contacts -

using google apps script, i'm trying take date written in spreadsheet , add date field contact. specifically, cannot seem convert month of javascript date read spreadsheet month enum contact.adddate method can use.

var months = contactsapp.month.values; var birthdate = new date( spreadsheet_date ); var month = months[ birthdate.getmonth() ]; contact.adddate(contactsapp.field.birthday,       month, birthdate.getdate(), birthdate.getfullyear() ); 

there lots of ways approach, see switch easiest, there's no one-liner though, there's no month name built javascript:

var month = birthdate.getmonth(); switch(month){    case 0:       month = contactsapp.month.january;       break;    case 1:       month = contactsapp.month.february;       break;    [...]    case 11:       month = contactsapp.month.december       break; }