[development-axapta] datediff equivalent in X++

[larrybellou]

How can I figure out the difference in # of days between two dates?

Can it be done using a select statement as well?

The following t-sql is what I am trying to accomplish but if you can 
answer one or both of the above questions would help me get there as 
well..

T-SQL
select avg(datediff(day, transdate, closed)) from custtrans ct (nolock) 
where accountnum='aa122'and closed > '1/1/1900'  and dataareaid='demo' 
and amountmst>0 and transdate >= getdate()-90 

    select custTrans where 
        localCustTrans.AccountNum=='ba368'
        && localCustTrans.Closed != datenull() 
        && localCustTrans.AmountMST > 0
        && localCustTrans.TransDate >= systemdateget()-90;