JAVASCRIPT

js date subtract days

    dayRemove(daysToAdd) {
      const now = new Date();
      this.data = new Date(now.getTime() - daysToAdd * 86400000).toISOString().substr(0, 10);
    },

js subtract days

var dateOffset = (24*60*60*1000) * 5; //5 days
var myDate = new Date();
myDate.setTime(myDate.getTime() - dateOffset);

dayjs subtract days

dayjs().subtract(7, 'day') // you can also put month, year etc