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Thanks Denis, But it didnt worked for me. I tried some javascript and it worked.
Code:
<script>
var dob = '{q1}'.split(' ')[0]; //q1 is date question.
var dobarr = dob.split('-');
var dobY = Number(dobarr[0]);
var dobM = Number(dobarr[1]);
var dobD = Number(dobarr[2]);
var nowarr = '{date('Y-m-d')}'.split('-');
var nowY = Number(nowarr[0]);
var nowM = Number(nowarr[1]);
var nowD = Number(nowarr[2]);
var months = ((nowY - dobY)*12) + (nowM-dobM) + Number(((nowD-dobD)/30).toFixed(2));
//set months in your open end question using javascript
</script>
