>>>>>>Fabio,
>>>>>>I already sent an age calculation that returns those expected dates:)
>>>>>>Here is it shortenehed:
>>>>>>
>>>>>
>>>>>
>>>>>Sorry
>>>>>

>>>>>.CalcAge({^1988/2/29} ,  {^1991/2/27 })
>>>>>Observed 2 , 11,  30
>>>>>Expected 2 , 11,  29
>>>>>

>>>>>
>>>>>Fabio
>>>>
>>>>Why 29? 30 is correct.
>>>>Cetin
>>>
>>>

>>>{^1988/2/29} + 2 years + 11 month + 0 days = {^1991/1/29}
>>>? {^1991/1/29}+30
>>>

>>
>>If you're born before March 1st, then next year you're 1 year older before March 1st, right?
>>
>>{^1988/2/29} + 2 years = {^1990/2/28} && 2 years old now
>>{^1990/2/28} + 11 months = {^1991/1/28}
>>{^1991/1/28} + 30 days = {^1991/2/27}
>>
>>Cetin
>
>Hi Cetin.
>
>Right. My error. I use YMD difference, but compute MD difference.
>
>Now i have fully definition for difference of two dates:
>

>*   D = Days                => dEnd = dBegin + Days
>*  MD = Months,Days         => dEnd = GOMONTH(dBegin,Months)+ Days
>* YMD = Years,Months,Days   => dEnd = GOMONTH(GOMONTH(dBegin,12*Years),Months)+ Days
>

>Important:
> the Associative Rule is not valid for Y,M or M additions
>That is:
>

>YMD = (2,1,3) <> (1,0,0)+(1,1,3)
>

>
>But, i check YMD, and your CalcAge lose a day when dBegin is 29/2/XXXX :
>

>CalcAge({^1988/2/29} ,  {^2006/9/14 })
>Observed : 18,6,16
>Expected : 18,6,17
>*{^1988/2/29} + 18 years = {^2006/2/28} + 6 months = {^2006/8/28} + 16 = {^2006/9/13}
>

>
>Fabio

OK wanted to show teh guy one day younger.
Now I've another puzzle to solve. If you're interested check OLE automation section. I'll create it now with title "Why not 1*(0.5-0.4-0.1) = 0?".
Cetin