I have an input box for the user to enter the full name of the month for the
report. Then there is a whole slew of code that follows. The value is then
entered into the sheet, and I have formulas that look for this value.

Unfortunately, if the user does not enter the entire name of the month and
in all caps, it doesn't work.

How can I make it so I have some kind of error-checker. For example, if the
users enters january, January, or JANYOUARIE then the code will stop, but if
the user enters JANUARY, FEBRUARY, MARCH, ... etc, then the code continues.
I cant figure out the if/then/else