SOURCE

function comptime() {
    var beginTime = "2013-09-21 00:00:04";
    var endTime = "2023-09-21 00:00:03";
    var beginTimes = beginTime.substring(0, 10).split('-');
    var endTimes = endTime.substring(0, 10).split('-');

    beginTime = beginTimes[0] + '-' + beginTimes[1] + '-' + beginTimes[2] + ' ' + beginTime.substring(10, 19);
    endTime = endTimes[0] + '-' + endTimes[1] + '-' + endTimes[2] + ' ' + endTime.substring(10, 19);

    alert(beginTime + "   aaaaaaaa   " + endTime);
    alert(Date.parse(endTime));
    alert(Date.parse(beginTime));
    var a = (Date.parse(endTime) - Date.parse(beginTime));
    alert("比较结果为："+a);
    if (a < 0) {
        alert("endTime小!");
    } else if (a > 0) {
        alert("endTime大!");
    } else if (a == 0) {
        alert("时间相等!");
    } else {
        return 'exception'
    }
}
comptime()

function comptime() {
    var beginTime = "2023-09-21 00:00:04";
    var endTime = "2023-09-21 00:00:01";
    var beginTimes = beginTime.substring(0, 10).split('-');
    var endTimes = endTime.substring(0, 10).split('-');

    beginTime = beginTimes[1] + '-' + beginTimes[2] + '-' + beginTimes[0] + ' ' + beginTime.substring(10, 19);
    endTime = endTimes[1] + '-' + endTimes[2] + '-' + endTimes[0] + ' ' + endTime.substring(10, 19);

    alert(beginTime + "aaa" + endTime);
    alert(Date.parse(endTime));
    alert(Date.parse(beginTime));
    var a = (Date.parse(endTime) - Date.parse(beginTime)) / 3600 / 1000;
    if (a < 0) {
        alert("endTime小!");
    } else if (a > 0) {
        alert("endTime大!");
    } else if (a == 0) {
        alert("时间相等!");
    } else {
        return 'exception'
    }
}
comptime()