js日期与时间比较函数多实例

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;
}

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)); //（脚本学堂 www.jb200.com 编辑整理）
    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'
    }
}

function dateadd(date1, day) {
var t = new date();
   if (day < 0) day = 0;
   var t = date.parse(date1) + day * 1000 * 3600 * 24;
   t.settime(t);
   return t;
}