Glad to be of help.
As a final point in EG's 'good excel for aviators' course, if you are using this spreadsheet for work, it is good practice to build in error checking calculations. In my example, I suggest at least:
=COLUMNS(Dates)=LastCell
If all is well this should evaluate to TRUE, if not then it will be FALSE. This will give you a visual indication if you have not copied the formula across correctly.