c# - Difference between two months - only based on months and not date -

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i using below code find month difference between 2 dates.

var watmonths = ((watinjenddate.year - waterstartdate.year) * 12) + watinjenddate.month - waterstartdate.month

for example:

waterstartdate = 9/28/2015 waterinjenddate = 12/4/2015

the answer above code 3. ultimate requirement "4" depicts months 9,10,11,12 waterstartdate in 9th month , enddate in 12th month of year.

what should modify in code?

in case, defining number of months between dates being inclusive of both month of start date , end date. number of months between 2015/1/1 , 2015/1/1 1. sure behavior want?

in order accomplish behavior described, add + 1 end of assignment.

var watmonths = ((watinjenddate.year - waterstartdate.year) * 12) +                      watinjenddate.month - waterstartdate.month + 1

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