Month Count using Two Dates

I was trying to count MONTHS using two dates. (eg. 1-JAN-2018 to 31-JAN-2018), my count results gives me 0.
Sorry, I cant not attach my file in Excel Forum.
Here is an attachment. -> One Drive

Please advise and help.

Thank You..

sorry, Jeff it does not work,
for example, 1/Feb/2015 to 31/Jul/2015, result should be 6 month count. (including FEB, MAR, APR, MAY, JUN, JUL).

Thanks for your quick response.

Perfect, Thanks for your kind help.