How to set future dates as default date in angular

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Typescript

I need to set future date as default date in angular,as of now I am getting today's date but I need to get 30 days ahead which has to be set as default date value

What I have tried:

date1 = new Date();
currentYear = this.date1.getfullYear();
CurrentMonth = this.date1.getMonth();
currentDay = this.date1.getDate();

Today date = "";
FinalMonth : any;
FinalDay : any= this.currentDay +30;

ngOnInit(): void{
if(this.finalDay>30 && this.FinalDay<=61){
this.FinalDay = this.FinalDay -30;
}
else{
this.FinalDay = this.currentDay;
}
if(this.currentMonth<=11){
this.FinalMonth= this.currentMonth +1;
}
if(this.currentMonth==12){
this.FinalMonth=1;
this.currentYear=this.currentYear +1;
}
this.FinalDate = this.currentyear+"-"+ this.FinalMonth+"-"+this.FinalDay;