Adding two different page numbers in A-master

@Sade5EBE 

Screenshot would be best...

The short answer is no; InDesign is very rigid about numbering pages and it's almost impossible to override the feature in any way.

The other answer is that you can number the pages yourself — which I'll get to in a minute.

I don't quite understand the problem here, though. If you have one page per day, and you (for the author) want serial page numbers... at what point does the page number not align with the day-number of the year (that is, June 1 being about Day/Page 180)? You should be able to have a date string of some configuration, and a page number, without any conflict. More details will help, here.

The basic way to get around InDesign's rigid numbering system, though, is to number it yourself. Put a small text frame on your Parent page, where you want the page number. On the first page using that Parent (that I assume you want to be Page 1), dump in a text file of the numbers from 1–365 or whatever, one per line/paragraph. Apply a style that both formats the number to your liking and forces a break to the next frame, so that each frame throughout the document has one and only one number.  You can modify this process in all kinds of ways, such as numbering only even or odd pages, doubling up a page number (so you have two Page 2's on a single document page, etc.) or using nonlinear or fancy-symbol numbering.

If that doesn't solve your problem, explain further what you're trying to accomplish.