这将给你当前日期字符串

var today = new Date().toISOString().split('T')[0];

这是我只用jQuery得出的结果。只是把碎片拼在一起的问题。

        //Gather date information from local system
        var ThisMonth = new Date().getMonth() + 1;
        var ThisDay = new Date().getDate();
        var ThisYear = new Date().getFullYear();
        var ThisDate = ThisMonth.toString() + "/" + ThisDay.toString() + "/" + ThisYear.toString();

        //Gather time information from local system
        var ThisHour = new Date().getHours();
        var ThisMinute = new Date().getMinutes();
        var ThisTime = ThisHour.toString() + ":" + ThisMinute.toString();

        //Concatenate date and time for date-time stamp
        var ThisDateTime = ThisDate  + " " + ThisTime;

因为问题被标记为jQuery:

如果你也在使用jQuery UI，你可以使用$.datepicker.formatDate():

$.datepicker.formatDate('yy/mm/dd', new Date());

请看这个演示。

这一行语句将给出YYYY-MM-DD:

new Date().toISOString().substr(0, 10)

'2022-06-09'

当元素只有一个符号时，该对象设0:

function addZero(i) {
    if (i < 10) {
        i = "0" + i;
    }
    return i;
}

该对象设置实际的完整时间，小时和日期:

function getActualFullDate() {
    var d = new Date();
    var day = addZero(d.getDate());
    var month = addZero(d.getMonth()+1);
    var year = addZero(d.getFullYear());
    var h = addZero(d.getHours());
    var m = addZero(d.getMinutes());
    var s = addZero(d.getSeconds());
    return day + ". " + month + ". " + year + " (" + h + ":" + m + ")";
}

function getActualHour() {
    var d = new Date();
    var h = addZero(d.getHours());
    var m = addZero(d.getMinutes());
    var s = addZero(d.getSeconds());
    return h + ":" + m + ":" + s;
}

function getActualDate() {
    var d = new Date();
    var day = addZero(d.getDate());
    var month = addZero(d.getMonth()+1);
    var year = addZero(d.getFullYear());
    return day + ". " + month + ". " + year;
}

HTML:

<span id='full'>a</span>
<br>
<span id='hour'>b</span>
<br>    
<span id='date'>c</span>

JQUERY的观点:

$(document).ready(function(){
    $("#full").html(getActualFullDate());
    $("#hour").html(getActualHour());
    $("#date").html(getActualDate());
});

例子

function returnCurrentDate() {
                var twoDigitMonth = ((fullDate.getMonth().toString().length) == 1) ? '0' + (fullDate.getMonth() + 1) : (fullDate.getMonth() + 1);
                var twoDigitDate = ((fullDate.getDate().toString().length) == 1) ? '0' + (fullDate.getDate()) : (fullDate.getDate());
                var currentDate = twoDigitDate + "/" + twoDigitMonth + "/" + fullDate.getFullYear();
                return currentDate;
            }