JS date and time format (year, month, day, hour, minute, second, week, quarter, time difference acquisition, date and timestamp conversion function)

Encapsulates a tool class for date formatting
The notes are very clear

(function(window){
    
    window.pub = {
    
        //  Format date 
        dateFormat:function(format,date){
    
            /* *  If there is a name in the document dateFormat, You can use dFormat() call  *  year (Y)  You can use 1-4 Placeholders  *  month (m)、 Japan (d)、 Hours (H)、 branch (M)、 second (S)  You can use 1-2 Placeholders  *  week (W)  You can use 1-3 Placeholders  *  quarter (q For Arabic numerals ,Q Chinese numbers ) You can use 1 or 4 Placeholders  * * let date = new Date() * dateFormat("YYYY-mm-dd HH:MM:SS", date) 2020-02-09 14:04:23 * dateFormat("YYYY-mm-dd HH:MM:SS Q", date) 2020-02-09 14:09:03  One  * dateFormat("YYYY-mm-dd HH:MM:SS WWW", date) 2020-02-09 14:45:12  Sunday  * dateFormat("YYYY-mm-dd HH:MM:SS QQQQ", date) 2020-02-09 14:09:36  first quarter  * dateFormat("YYYY-mm-dd HH:MM:SS WWW QQQQ", date) 2020-02-09 14:46:12  Sunday   first quarter  */
            let we = date.getDay();                                 //  week 
            let qut = Math.floor((date.getMonth()+3)/3).toString(); //  quarter 
            const opt = {
    
                "Y+":date.getFullYear().toString(),                 //  year 
                "m+":(date.getMonth()+1).toString(),                //  month ( Month from 0 Start , want +1)
                "d+":date.getDate().toString(),                     //  Japan 
                "H+":date.getHours().toString(),                    //  when 
                "M+":date.getMinutes().toString(),                  //  branch 
                "S+":date.getSeconds().toString(),                  //  second 
                "q+":qut, //  quarter 
            };
            const week = {
          //  Chinese numbers  ( week )
                "0":" Japan ",
                "1":" One ",
                "2":" Two ",
                "3":" 3、 ... and ",
                "4":" Four ",
                "5":" 5、 ... and ",
                "6":" 6、 ... and "
            };
            const quarter = {
       //  Chinese numbers （ quarter ） 
                "1" : " One ", 
                "2" : " Two ", 
                "3" : " 3、 ... and ", 
                "4" : " Four ", 
            }; 
            if(/(W+)/.test(format)){
    
                format = format.replace(RegExp.$1,(RegExp.$1.length >1 ? (RegExp.$1.length >2 ? ' week '+week[we] : ' Zhou '+week[we]) : week[we]))
            };
            if (/(Q+)/.test(format)) {
      
                //  Enter a Q, Only one Chinese number is output , Input 4 individual Q, Then concatenate the string  
                format = format.replace(RegExp.$1,(RegExp.$1.length == 4 ? ' The first '+quarter[qut]+' quarter ' : quarter[qut])); 
            };
            for(let k in opt){
    
                let r = new RegExp("("+k+")").exec(format);
                if(r){
    
                    //  If the input length is not 1, Then fill in zero before 
                    format = format.replace(r[1],(RegExp.$1.length == 1 ? opt[k] : opt[k].padStart(RegExp.$1.length,'0')))
                }
            };
            return format;
        },
        //  Time difference 
        //  Small in front and big in back 
        getTimeBetween:function(dateString1,dateString2){
    
            let TimeBetween = {
    };
            let startDate = Date.parse(dateString1);
            let endDate = Date.parse(dateString2);
            //  Days 
            TimeBetween.days = (endDate - startDate)/(1*24*60*60*1000);
            //  Hours 
            TimeBetween.hours = TimeBetween.days * 24;
            //  minute 
            TimeBetween.mins = TimeBetween.days * 24 * 60;
            //  Number of seconds 
            TimeBetween.sec = TimeBetween.days * 24*60*60;
            return TimeBetween;
        },
        //  Format time difference 
        formatTB:function(dateString1,dateString2){
    
            let date = getTimeBetween(dateString1,dateString2);
            date.days = date.sec/86400;
            date.hours = date.sec%86400/3600;
            date.mins = date.sec%86400%3600/60;
            return date;
        },
        //  Timestamp conversion 
        getTimeStamp:function(date){
    
            let TStamp = {
    };
            //  Date to time stamp 
            TStamp.timeStamp = Date.parse(date);
            //  Time stamp date  
            TStamp.dateTime = new Date(date);   // You can use the above dateFormat Format time 
            return TStamp;
        }
    }
})(window)