js时间日期格式化和大小比较

Date.prototype.format = function (format) {
    var o = {
        "M+": this.getMonth() + 1,  //month 
        "d+": this.getDate(),       //day 
        "h+": this.getHours(),      //hour 
        "m+": this.getMinutes(),    //minute 
        "s+": this.getSeconds(),    //second 
        "q+": Math.floor((this.getMonth() + 3) / 3),    //quarter 
        "S": this.getMilliseconds() //millisecond 
    }

    if (/(y+)/.test(format)) {
        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }

    for (var k in o) {
        if (new RegExp("(" + k + ")").test(format)) {
            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
        }
    }
    return format;
}

//比较日前大小  
function compareDate(checkStartDate, checkEndDate) {
    var arys1 = new Array();
    var arys2 = new Array();
    if (checkStartDate != null && checkEndDate != null) {
        arys1 = checkStartDate.split('-');
        var sdate = new Date(arys1[0], parseInt(arys1[1] - 1), arys1[2]);
        arys2 = checkEndDate.split('-');
        var edate = new Date(arys2[0], parseInt(arys2[1] - 1), arys2[2]);
        if (sdate > edate) {
            //alert("日期开始时间大于结束时间");
            return false;
        } else {
            //alert("通过");
            return true;
        }
    }
}

//判断日期，时间大小  
function compareTime(startDate, endDate) {
    if (startDate.length > 0 && endDate.length > 0) {
        var startDateTemp = startDate.split(" ");
        var endDateTemp = endDate.split(" ");

        var arrStartDate = startDateTemp[0].split("-");
        var arrEndDate = endDateTemp[0].split("-");

        var arrStartTime = startDateTemp[1].split(":");
        var arrEndTime = endDateTemp[1].split(":");

        var allStartDate = new Date(arrStartDate[0], arrStartDate[1], arrStartDate[2], arrStartTime[0], arrStartTime[1], arrStartTime[2]);
        var allEndDate = new Date(arrEndDate[0], arrEndDate[1], arrEndDate[2], arrEndTime[0], arrEndTime[1], arrEndTime[2]);

        if (allStartDate.getTime() >= allEndDate.getTime()) {
            //alert("startTime不能大于endTime，不能通过");
            return false;
        } else {
            //alert("startTime小于endTime，所以通过了");
            return true;
        }
    } else {
        alert("时间不能为空");
        return false;
    }
}

//比较日期，时间大小  
function compareCalendar(startDate, endDate) {
    if (startDate.indexOf(" ") != -1 && endDate.indexOf(" ") != -1) {
        //包含时间，日期  
        compareTime(startDate, endDate);
    } else {
        //不包含时间，只包含日期  
        compareDate(startDate, endDate);
    }
}