js時間相減

//調用 date1-date2

    var mytime= dateDiff('2011-12-29 10:20:56','2011-12-30 14:13:25');

    //時間相減少方法(主方法)

    function dateDiff(date1, date2){ 

        var getTime1=stringToTime(date1,'getTime');

        var getTime2=stringToTime(date2,'getTime');

        if(getTime2>getTime1)

           return "暫無資料";

        var lstSec=(getTime1-getTime2)/1000;

        var showtime= formatSeconds(lstSec);

        return showtime;//結果是秒 

    }

    //字元串轉成Time(dateDiff)所需方法 

    function stringToTime(string,timeType){ 

        var f = string.split(' ', 2); 

        var d = (f[0] ? f[0] : '').split('-', 3); 

        var t = (f[1] ? f[1] : '').split(':', 3); 

        var mydate= (new Date( 

        parseInt(d[0], 10) || null, 

        (parseInt(d[1], 10) || 1)-1, 

        parseInt(d[2], 10) || null, 

        parseInt(t[0], 10) || null, 

        parseInt(t[1], 10) || null, 

        parseInt(t[2], 10) || null 

        ));

        if(timeType=="getSeconds") 

           return mydate.getSeconds();

        else if(timeType=="getMinutes") 

           return mydate.getMinutes();

        else if(timeType=="getHours") 

           return mydate.getHours();

        else if(timeType=="getTime") 

           return mydate.getTime();

        else

           return mydate;

    }

    //格式化秒數為時分秒

    function formatSeconds(seconds) {  

         if(seconds >0){  

             var minutes = Math.floor(seconds/60);  

             seconds = seconds - minutes * 60;  

             return formatMinutes(minutes) + (seconds > 0 ? seconds + "秒" : "");  

         }  

         return seconds;  

    } 

    //格式化分鐘為時分  

    function formatMinutes(minutes){  

         var day = parseInt(Math.floor(minutes / 1440));  

         var hour = day >0?Math.floor((minutes - day*1440)/60):Math.floor(minutes/60);  

         var minute = hour > 0 ? Math.floor(minutes -day*1440 - hour*60):minutes;  

         var time="";  

         if (day > 0) time += day + "天";  

         if (hour > 0) time += hour + "小時";  

         if (minute > 0) time += minute + "分鐘";  

         return time;  

    }