I wasn't quick enough following up .... davsth beat me to the answer.
For what it's worth, I also went with
The year can be anything you like, from 1900 on. In fact, you can just put 0, thus:
You're just trying to built something that the DATEVALUE function will interpret as a date so that you can then use MONTH to extract the month and thus convert it to a number. You then use the TEXT function to format the month number as 3 digits. That said, it seems a little pointless having three digits if the Invoice number is based on the month.
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