I don't understand: If the month ends in February, why would the month delay value be any different? As coded, the field allows for February to have either 28 or 29 days, depending on whether it's a leap year.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks for the replies by the way, I really appreciate the help.

I have an SQL database I'm pulling the date fields from and here is what happens. Unfortunately I can't modify the date in the database at all, so I have to do it all on the letter.

Paid_to_date = 16/08/2011.

Invoice from <delay by 1 day> to <delay by 1 month>

The above merge fields pull through the following information.

Invoice from 17/08/2011 to 16/09/2011.

However without changing anything, if I create the letter from a file with a paid to date anywhere in February, it does the following:

Paid_to_date = 14/02/2011

Invoice from 12/02/2011 to 14/03/2011.

If I set the delay to 3, instead of 1. February then works fine. Maybe I typed something wrong. When I've a chance I'll double check it. But if the above field is correct, my letter should be correct.