Add a 0 in front of a number

Hello,

I am using a simple expression to make a calendar, going from 1 to 31

Until the number 10 i would like to display a 0 in front of the number.

Unfortunately everything I am trying doesn't work.

Here is the expression:

v=time/thisComp.frameDuration;

t = (v%31)+1;

if (t >0 && t < 10){

value=""+"0"+t;

}else{

value=t;}

I am on AE CC with Mac maverick.

Thanks

NIco