Javascript Date get date for certain days ago

Introduction

We would like to create a function getDateAgo(date,days) to return the day of month days ago from the date.

For instance, if today is 20th, then *getDateAgo(new Date(),1)* should be 19th.

*getDateAgo(new Date(),2)* should be 18th.

The function cannot modify the given date. 

let date = new Date(2020, 0, 2);

console.log( getDateAgo(date, 1) ); // 1, (1 Jan 2020)
console.log( getDateAgo(date, 2) ); // 31, (31 Dec 2019)
console.log( getDateAgo(date, 365) ); // 2, (2 Jan 2019)



 Code:
 function getDateAgo(date, days) {
   let dateCopy = new Date(date);
                                                                                                                                      
   dateCopy.setDate(date.getDate() - days);
   return dateCopy.getDate();
 }
                                                                                                                                      
 let date = new Date(2020, 0, 2);
                                                                                                                                      
 console.log( getDateAgo(date, 1) ); // 1, (1 Jan 2020)
 console.log( getDateAgo(date, 2) ); // 31, (31 Dec 2019)
 console.log( getDateAgo(date, 365) ); // 2, (2 Jan 2019)



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