I need some help. I am writing a formula to calculate my asset depreciation
schedule. The rule is, the new purchased asset will be depreciated for the
full in current month, no matter what date the asset purchased within the
month, the depreciation will be calculated for full month e.g. purchase on
29-Nov-06 will depreciate for 30 days in Nov.

I use EOMONTH function, it works in purchase month (refer Purchase Month
table 1). However, it doesnt work afterward, because EOMONTH calculated in
days (Refer After Purchase table 1). Then I changed into Month format. It
works in after purchase period (Refer After Purchase table 2) but then it
doesnt work in purchase month (Refer Purchase Month 2). I changed MONTH &
EOMONTH combine, it works in purchase month (Refer Purchase Month table 3)
but it doesnt work in after purchase (Refer After Purchase table 3).


Purchase Month
A1 B1 Formula Result
1 29-Nov-06 30-Nov-06 =EOMONTH(B1,0)-EOMONTH(A1,0) 0
2 29-Nov-06 30-Nov-06 =month((EOMONTH(B1,0)-EOMONTH(A1,0))) 1
3 29-Nov-06 30-Nov-06 =MONTH(EOMONTH(B1,0))-MONTH(EOMONTH(A1,0)) 0

After Purchase
A1 B1 Formula Result
1 29-Nov-06 30-Jun-07 =EOMONTH(B1,0)-EOMONTH(A1,0) 212
2 29-Nov-06 30-Jun-07 =month((EOMONTH(B1,0)-EOMONTH(A1,0))) 7
3 29-Nov-06 30-Jun-07 =MONTH(EOMONTH(B1,0))-MONTH(EOMONTH(A1,0)) -5