How to format timestamp function in javascript (with code)

The content of this article is about how to format the timestamp function in JavaScript (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Pass in the timestamp and return the formatted string

 formatDate(v) {
          if (/^(-)?\d{1,10}$/.test(v))
           {
             v = v * 1000;
           } 
           else if (/^(-)?\d{1,13}$/.test(v))
            {
              v = v * 1;
            }               
            var dateObj = new Date(v);               
            var month = dateObj.getMonth() + 1;               
             var day =  dateObj.getDate();               
            var hours = dateObj.getHours();               
            var minutes = dateObj.getMinutes();               
            var seconds = dateObj.getSeconds();               
            if(month<10){
                   month = "0" + month;
               }               
            if(day<10){
                   day = "0" + day;
               }               
             if(hours<10){
                   hours = "0" + hours;
               }               
             if(minutes<10){
                   minutes = "0" + minutes;
               }               
             if(seconds<10){
                   seconds = "0" + seconds;
               }               
             var UnixTimeToDate = dateObj.getFullYear() + &#39;-&#39; + month + &#39;-&#39; +day + &#39; &#39; + hours + &#39;:&#39; + minutes + &#39;:&#39; + seconds;               
             return UnixTimeToDate;
            }

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