you're welcome. as our computer settings in different computers for dates are different (some in d/m/y, some in m/d/y), it's better to write dates in number for day, spell out the 3 letters for months & years in numbers too. like:
29sep12
you'll know Excel recognises it as a date when it aligns itself to the right without any forced alignment. that is because Excel stores dates as numbers & numbers are aligned to the right. if you type a text like "abc", you'll realise it aligns to the left. this method is better than typing 1/2/2012 cause in my computer settings, it might be reading 1st Feb 2012 while yours may be interpreted as 2nd Jan 2012.
so assuming you have the start & end date now only in 2 separate cells in B20 & B21, the formula will be:
a little shorter. if you want to limit the users to input from 2010-2015, you can also use the data validation you did for List. but choose Date this time instead. and you can choose between 1 jan 2010 to 31 Dec 2015. Inside the Data Validation window, you can also go to the "Input Message" tab to let your user know what they ought to fill in, in case they are wondering why typing 2009 wont work
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