js 获取当前时间 和去年时间+一年或者-一年

    let myDate = new Date();
    let nowY = myDate.getFullYear();
    let nowM = myDate.getMonth() + 1;
    let nowD = myDate.getDate();
    let endDate = nowY + "" + (nowM < 10 ? "0" + nowM : nowM) + "" + (nowD < 10 ? "0" + nowD : nowD);// 当前日期

 var date = new Date();
    var y = date.getFullYear() - 1;// 减一是算去年时间，+ 1 是明年时间
    var m = date.getMonth();
    var d = date.getDate();
    var h= date.getHours();
    var minute = date.getMinutes();
    var s= date.getSeconds();
    var dateStr = '去年的今天是:'
      + y + "年"
      + (m + 1) + "月"
      + d+ "日"
      + h+ "时"
      + minute + "分"
      + s+ "秒";
    console.log(dateStr)