24hr time stamp format

[Polycontrast]

The function below prints the time using the 24hr clock format. When the hours, minutes and seconds are less than 10, the time value is printed in a single digit format. Can someone give me an idea of how to format the time so that it always prints in a double digit format.

For instance  the time 21:0:5  would be 21:00:05

  alert(runTime())

  function runTime () {

    try{

      var digital = new Date(); 

      var hours = digital.getHours(); 

      var minutes = digital.getMinutes(); 

      var seconds = digital.getSeconds();

      var milliseconds = digital.getMilliseconds();

      militaryTime = hours + ":" + minutes + ":" + seconds;  

      return militaryTime;

    } catch(e) {alert(e)}

  }

[c.pfaffenbichler]

var theNumber = 5;

alert (bufferNumberWithZeros(theNumber, 2));

////// buffer number with zeros //////

function bufferNumberWithZeros (number, places) {

var theNumberString = String(number);

for (var o = 0; o < (places - String(number).length); o++) {

theNumberString = String("0" + theNumberString)

};

return theNumberString

};

[Polycontrast]

Thank you!

[SuperMerlin]

alert(time());
function time(){
var date = new Date();
    var d  = date.getDate();
    var day = (d < 10) ? '0' + d : d;
    var m = date.getMonth() + 1;
    var month = (m < 10) ? '0' + m : m;
    var yy = date.getYear();
    var year = (yy < 1000) ? yy + 1900 : yy;
    var hours = date.getHours();
    var minutes = date.getMinutes();
    var seconds = date.getSeconds();
    if (hours <= 9) hours = "0" + hours;
    if (minutes <= 9) minutes = "0" + minutes;
    if (seconds <= 9) seconds = "0" + seconds;
    todaysDate =  hours + ":" + minutes + ":" + seconds;
    return todaysDate.toString();
};

[Polycontrast]

Thank you!

[sidpalas]

While both of the above answers are correct, I prefer the following method as it is slightly more succinct:

function makeTwoCharString(intIn){  
        return ("0" + intIn.toString()).slice(-2); 
        } 

As long as the input is between 0 and 99 (inclusive) it will return the desired two digit string.

Combining with your code gives:

alert(runTime());
function runTime () {
  try{
    var digital = new Date(); 
    var hours = makeTwoCharString(digital.getHours()); 
    var minutes = makeTwoCharString(digital.getMinutes()); 
    var seconds = makeTwoCharString(digital.getSeconds());
    militaryTime = hours + ":" + minutes + ":" + seconds;  
    return militaryTime;
  } catch(e) {alert(e)}
}