js日期时间比较函数

1、js日期比较(yyyy-mm-dd)

function duibi(a, b) {
var arr = a.split("-");
var starttime = new Date(arr[0], arr[1], arr[2]);
var starttimes = starttime.getTime();

var arrs = b.split("-");
var lktime = new Date(arrs[0], arrs[1], arrs[2]);
var lktimes = lktime.getTime();

if (starttimes >= lktimes) {

        alert('开始时间大于离开时间，请检查');
return false;
    }
else
return true;
}

2、js时间比较(yyyy-mm-dd hh:mi:ss)

function comptime() {
var beginTime = "2009-09-21 00:00:00";
var endTime = "2009-09-21 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'
    }
}

3、当前时间

    function CurentTime() {
var now = new Date();

var year = now.getFullYear();       //年
var month = now.getMonth() + 1;     //月
var day = now.getDate();            //日

var hh = now.getHours();            //时
var mm = now.getMinutes();          //分
var ss = now.getSeconds();          //秒

var clock = year + "-";

if (month < 10) {
            clock += "0";
        }
        clock += month + "-";

if (day < 10) {
            clock += "0";
        }
        clock += day + " ";

if (hh < 10) {
            clock += "0";
        }
        clock += hh + ":";
if (mm < 10) {
            clock += '0';
        }
        clock += mm;

return (clock);
    }