Date and Time string for filename with leading zeros

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Moderators: Kukurykus, Tom, xbytor

wade

Date and Time string for filename with leading zeros

Post by wade »

This is a pretty simple one, but I think I had read of a few people having issue with the old leading zero issue when using the date in the filename.

Code: Select allfunction getDateTimeStr(){
    var newDateTime = new Date();
    var outDate = newDateTime.getFullYear().toString();
    var theMonth = (newDateTime.getMonth()+1).toString();
       outDate += ((theMonth.length<2)?"0":"")+theMonth;
       theMonth = null;
    var theDate = newDateTime.getDate().toString();
       outDate += ((theDate.length<2)?"0":"")+theDate;
       outDate += "_";
       theDate = null;
    var theHours = newDateTime.getHours().toString()
       outDate += ((theHours.length<2)?"0":"")+theHours;
       theHours = null;
    var theMins = newDateTime.getMinutes().toString()
       outDate += ((theMins.length<2)?"0":"")+theMins;
       theMins = null;
       newDateTime = null;
   return outDate;
}


note: the year/month/date format is very valuable for sorting

Andrew

Date and Time string for filename with leading zeros

Post by Andrew »

I was doing something with dates the other day and found this function written by Xbytor very useful (I don't think I altered it, but I may have)

Code: Select allfunction toISODateString (date, timeDesignator, dateOnly) {
   if (!date) date = new Date();
   var str = '';
   if (timeDesignator == undefined) { timeDesignator = 'T' };
   
   function _zeroPad(val) { return (val < 10) ? '0' + val : val; }

   if (date instanceof Date) {
      str = date.getFullYear() + '-' +
            _zeroPad(date.getMonth()+1,2) + '-' +
            _zeroPad(date.getDate(),2)
      if (!dateOnly) {
         str += timeDesignator +
         _zeroPad(date.getHours(),2) + ':' +
         _zeroPad(date.getMinutes(),2) + ':' +
         _zeroPad(date.getSeconds(),2);
      }
   }
   return str;
}

Andrew

xbytor

Date and Time string for filename with leading zeros

Post by xbytor »

A good starting point for details on ISO 8601 is here http://en.wikipedia.org/wiki/ISO_8601.

wade

Date and Time string for filename with leading zeros

Post by wade »

in the end i brought it all together as
Code: Select allfunction getDateTimeStr(){
    function _zeroPad(val,len){
        val = val.toString();
        len = (len)?len:2;
        while(val.length<len){
            val = "0" + val;
        }
        return val;
    }
    var newDateTime = new Date();
    var outDate = newDateTime.getFullYear().toString();
        outDate += _zeroPad(newDateTime.getMonth()+1,2);
        outDate += _zeroPad(newDateTime.getDate(),2);
        outDate += "T";
        outDate += _zeroPad(newDateTime.getHours(),2);
        outDate += _zeroPad(newDateTime.getMinutes(),2);
        outDate += "-";
        outDate += _zeroPad(newDateTime.getSeconds(),2);
        outDate += "-";
        outDate += _zeroPad(newDateTime.getMilliseconds(),3);
        outDate += "+";
        newDateTime = null;
    return outDate;
}

This is specific to the current date and time for file naming, but could easily be modified to accept a date as a param.