toLocateString doesn't give me the correct output

Question

toLocateString isn't working as intended, it should give me the long version of the month but instead it gives me just the number, i've tried to switch to the default and nothing changes

     data(){
        return{
            currentMonth: new Date().getMonth().toLocaleString("it-IT", { month: "short" }),
            
            days:['Dom','Lun','Mar','Mer','Gio','Ven','Sab'],
        }
    },

Answer 1

Just use:

Date().toLocaleString("it-IT", { month: "long" })

because new Date().getMonth() returns month index