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Excel/Formula to calc. number of missing days


Hi. Aiden,

I monitor the daily energy used (kwh)through out the year.
I need a formula to calculate the number of days between two dates within a column of consecutive dates say 1-Jan-12 to 31-Dec-12.
On occasions there is no corresponding data attached to some of the dates i.e. say 19-Feb-12 to 5-Mar-12 and 10-Mar-12 to 12-Mar-12 (there are varying periods 2days,5days 15days etc.)
The resulting figure from the formula are is to calculate an average for the missed periods.

Hope you can help.


If it is literally the DAYS you want then its simply last day minus first day - as excel stores dates as serial numbers.

Not sure if this gives you what you need - if it doesn't it's possible that seeing a sample sheet might help, my direct email is
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Aidan Heritage


I have provided first hand support since `95 for Microsoft Office majoring in Word and Excel - support for all versions from 2 onwards. I'm based in the UK, so please allow for time differences when asking me questions from other parts of the world! As AllExperts closes down, just google me to find my details - I will still be around answering questions!


My background is in the insurance industry and call centre areas, but have been called upon to provide many varied solutions.

I'm educated to UK A level standard, but as I left school some 30 years ago that is rather irrelevent - university of life has provided more of a background!

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