Automatic Lines for Dividing Lists

This was a great tip! I found a macro to do the same, but it wouldn't underline the entire row. TIP: it's written down above, but is easy to miss: DO NOT SELECT THE HEADER ROW! Let's assume the header is Row 1. If you don't select the header row, your formula is "=$a2<>$a3. HOWEVER: If you do select the header row, then either change the "Applies to" in the rule to "=$2:$xxxxxxx", OR change the formula to "=$a1<>$a2".

BBN,
Assuming your dates are in column A starting in A1 with a title, use the following formula in Conditional Formatting, applied to range A2:?? (to suit your data) & set whatever formatting you want.

=IFERROR(MONTH(A2)<>MONTH(A1),1)

This will find the beginning of the month, if you prefer the end of the month use the following formula applied to the same range

=(MONTH(A3)<>MONTH(A2)

The IFERROR in the first formula deals with the title in A1, it is not required in the second formula as there is no reference to A1.

All the usual warnings when applying Conditional Formatting, as to inserting rows or adding data to the end of the list. It is also possible to use VBA to apply formatting to a required range, but that might be a step too far at the moment.

HTH

Steve

Geoff: One option is to apply the conditional formatting way beyond the end of your data. In Home > Conditional Formatting > Manage Rules, adjust the Applies To range to apply the formatting to some suitable row number depending on your data (say row 10,000), e.g. $A$2:$A$10000.
If this produces undesirable effects below your data, qualify the condition using an IF expression, e.g. IF (A2<>"", <your condition>).

I used to work for a company that had several hundred clients, for each of which I'd have to perform an annual task on a day specific to that client. I did up a spreadsheet and just manually kept a solid black line between each of the months as I liked to see what was coming up as each month approached. Is there a variation on that formula that could be used on such a spreadsheet to separate the months? (Note: I know I *could* use conditional formatting to just use, example, shading, but two problems: one, I actually dislike shaded cells and find they make data *more* difficult for me to read rather than less. And two, we only had a very old b&w printer, and any spreadsheet using colored cells just looked like garbage when printed off.)

I use this conditional formatting in a spreadsheet I have developed, but I often find that the formatting does not copy down prperly when adding data at the bottom of the table (ie adding rows at the bottom) . Is there a reliable way to have the formatting copied down automatically as new data is entered? I have tried copying the formatting down below the data, but the new rows appear to overwrite the conditional formatting.