Changing the starting year on the Qualtrics date question

Can you show the JS code you're working with? You should just have to change the one line where it says  

var yearFirst = 1900; //min is 1900

var yearFirst = 1978; //min is 1978

I actually did that. Here is the code:
Qualtrics.SurveyEngine.addOnload(function()
{
  
  //Set years you would like to have available 
  
  var yearFirst = 1978; //Min 1900
  var yearLast = 2049; //Max 2049
  
  
  //This all remains unchanged
  var qid=this.questionId;
  var mo=document.getElementsByName('QR~'+qid+'#1~1')[0];
  var day=document.getElementsByName('QR~'+qid+'#2~1')[0];
  var yr=document.getElementsByName('QR~'+qid+'#3~1')[0];
    
  var j = yearLast-1976;
  for(i=j;i<151;i++){
    yr.remove(j);
  }
  
  for(i=1;i<=yearFirst-1978;i++){
    yr.remove(1);
  }
  
  function fixer()
  {
    day.options[29].disabled=0;
    day.options[30].disabled=0;
    day.options[31].disabled=0; 
    if(mo.selectedIndex==2||mo.selectedIndex==4||mo.selectedIndex==6||mo.selectedIndex==9||mo.selectedIndex==11)
    {
      day.options[31].disabled=1;
      if(day.selectedIndex==31){day.selectedIndex=30};
      if(mo.selectedIndex==2)
      {
        day.options[30].disabled=1;
        if(day.selectedIndex==30){day.selectedIndex=29};                      
        if(parseInt(yr.options[yr.selectedIndex].innerHTML,10)%4!=0)
        {
          day.options[29].disabled=1;
          if(day.selectedIndex==29){day.selectedIndex=28}; 
        }
        else
        {
          day.options[29].disabled=0;
        }      
      }
    }
  
  }
                                
  yr.onchange=function(){fixer();};
  mo.onchange=function(){fixer();};


    
});

It looks like you changed a few more lines in there. You should only change the first part:
var yearFirst = 1978; //Min 1900
var yearLast = 2049; //Max 2049
and leave the rest of the code (everything after

//This all remains unchanged

OK. I see what the trouble is. We actually removed the "day" column. That is impacting the yearFirst value. When I had the day column in, it was fine.
Do you have any suggestions, please?
Thanks again,
Erin

But there's more! I figured out the fix on the year; updated the qid that it was accessing.
However, (and there's always a however), I have 2 questions in a row for the dates.
So the first one is fine now. But the year on the "move out" is still set to 1900. The JS code is only set for the first one?
Again, any suggestions much appreciated.
Sincerely,
Erin

Hmm. How about a workaround instead - could you forego the Javascript altogether and set up a Side by Side matrix style question with dropdown lists in each column? Then you can copy/paste in a list of the months and years you want in each column. Since you're not including the day column (and therefore won't have impossible cases you'll want to exclude, such as there being 31 days in February), I think you can get by with that solution