When working with the DATE function to subtract one month from a given dat,
using the following string:
=TEXT(DATE(YEAR(Report_Date),MONTH(Report_Date)-1,DAY(Report_Date)),"mmm yy")
& " YTD Actual", the formula doesn't fully take account of different length
months.

If I use the date 31/10/06 the prior month returned is still October. To
correct this I have to use 30/10/6 instead, then check each instance of the
formula to ensure all report headings are correct.

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