CRM 2011 Date Time Duration

Date Time Duration between two field.
*Note duration field is in decimal type. That mean the calculation can calculate until decimal point. At here u can set the amount of decimal point u want to see at the field.

Javascript Eg.

function getAging() { 
     var Answer = 0; 
     var AgingStartTime = Xrm.Page.data.entity.attributes.get("FieldName").getValue();
     var AgingEndTime = Xrm.Page.data.entity.attributes.get("FieldName").getValue(); 
     if (AgingStartTime != null) { 
         //Date time duration different between today and AgingStartTime
         var today = new Date();  
         Answer = (today - AgingStartTime) / 1000 / 60 / 60 / 24; 
         //Date time duration different between AgingStartTime and AgingEndTime 
         Answer = ( AgingStartTime  -  AgingEndTime ) / 1000 / 60 / 60 / 24; 
     } 
     else { Answer = null; } 
    //Which field to put the answer record to.
     Xrm.Page.data.entity.attributes.get("FieldName").setValue(Answer); 
}

End.