Excel：计算日期范围内的月数，但仅限于特定年份

Question

My sheet looks like this (sample data)

"Rate" "Begin" "End"
"1$" "01.01.2011" "01.01.2015"
"2$" "01.06.2012" "01.08.2013"

I want to calculate the number of months for the date ranges which fall in specific years (2012, 2013, 2014) to estimate volume (= months*rate) For example in the 2nd line I would get 6 months for 2012 (=12$) and 7 months for 2013 (=14$). How can I achieve this?

Answer 1

Assuming you have your data in A1:C3 then list the years in the header row, eg D1 = 2012, E1 = 2013, F1 = 2014 then in D2 use this formula:

=IFERROR(DATEDIF(MAX($B2,DATE(D$1,1,1)),MIN($C2,DATE(D$1+1,1,1)),"m"),0)*$A2

format as currency and copy across and down

Assumes you are using Excel 2007 or later and that columns B and C contain valid dates. In earlier Excel versions you can use this alternative formula

=LOOKUP(99^99,IF({1,0},0,DATEDIF(MAX($B2,DATE(D$1,1,1)),MIN($C2,DATE(D$1+1,1,1)),"m")*$A2))