如果你需要它作为一个字符串，例如:

var defaultTime: new Date().getHours() + 1 + ":" + new Date().getMinutes();

如果你需要它作为一个字符串，例如:

var defaultTime: new Date().getHours() + 1 + ":" + new Date().getMinutes();

对于JavaScript中简单的加/减小时/分钟函数，试试这个:

function getTime (addHour, addMin){
    addHour = (addHour ? addHour : 0);
    addMin = (addMin ? addMin : 0);
    var time = new Date(new Date().getTime());
    var AM = true;
    var ndble = 0;
    var hours, newHour, overHour, newMin, overMin;

    // Change form 24 to 12 hour clock
    if(time.getHours() >= 13){
        hours = time.getHours() - 12;
        AM = (hours>=12 ? true : false);
    }else{
        hours = time.getHours();
        AM = (hours>=12 ? false : true);
    }

    // Get the current minutes
    var minutes = time.getMinutes();

    // Set minute
    if((minutes + addMin) >= 60 || (minutes + addMin) < 0){
        overMin = (minutes + addMin) % 60;
        overHour = Math.floor((minutes + addMin - Math.abs(overMin))/60);
        if(overMin < 0){
            overMin = overMin + 60;
            overHour = overHour-Math.floor(overMin/60);
        }
        newMin = String((overMin<10 ? '0' : '') + overMin);
        addHour = addHour + overHour;
    }else{
        newMin = minutes + addMin;
        newMin = String((newMin<10 ? '0' : '') + newMin);
    }
    // Set hour
    if((hours + addHour >= 13) || (hours + addHour <= 0)){
        overHour = (hours + addHour) % 12;
        ndble = Math.floor(Math.abs((hours + addHour)/12));
        if(overHour <= 0){
            newHour = overHour + 12;
            if(overHour == 0){
                ndble++;
            }
        }else{
            if(overHour == 0){
                newHour = 12;
                ndble++;
            }else{
                ndble++;
                newHour = overHour;
            }
        }
        newHour = (newHour<10 ? '0' : '') + String(newHour);
        AM = ((ndble + 1) % 2 === 0) ? AM : !AM;
    }else{
        AM = (hours + addHour == 12 ? !AM : AM);
        newHour = String((Number(hours) + addHour < 10 ? '0': '') + (hours + addHour));
    }
    var am = (AM) ? 'AM' : 'PM';
    return new Array(newHour, newMin, am);
};

这可以不带参数地使用来获取当前时间:

getTime();

或者使用参数来获得添加分钟/小时的时间:

getTime(1, 30); // Adds 1.5 hours to current time
getTime(2);    // Adds 2 hours to current time
getTime(0, 120); // Same as above

即使是负时间也可以:

getTime(-1, -30); // Subtracts 1.5 hours from current time

这个函数返回一个数组:

array([Hour], [Minute], [Meridian])

检查它是否还没有定义。否则，在Date原型中定义它:

if (!Date.prototype.addHours) {
    Date.prototype.addHours = function(h) {
        this.setHours(this.getHours() + h);
        return this;
    };
}

有点乱，但很管用!

给出如下日期格式:2019-04-03T15:58

  //Get the start date.
  var start = $("#start_date").val();
  //Split the date and time.
  var startarray = start.split("T");
  var date = startarray[0];
  var time = startarray[1];

  //Split the hours and minutes.
  var timearray = time.split(":");

  var hour = timearray[0];
  var minute = timearray[1];
  //Add an hour to the hour.
  hour++;
  //$("#end_date").val = start;
  $("#end_date").val(""+date+"T"+hour+":"+minute+"");

您的输出将是:2019-04-03 t16 . 58

kennebec建议的版本在切换到DST或从DST时将失败，因为它是设置的小时数。

this.setUTCHours(this.getUTCHours()+h);

加上h小时，与时间系统特性无关。

Jason Harwig的方法也很有效。