Variables for all .fm files on the .book

[RaulM21]

Is it possible to create a variable for displaying a date over all .fm files contained on a .book?

My .book structure is the next:

Catalog.book

-Title.fm

-Index.fm

-Content.fm

Each time I need to update the date of the catalog, I should edit the master page of index, and both master pages (left/right) of the content.

Is there an easier way to make those changes?

By the time I have a variable called 'revision_date' in both files, but I must change them twice.

Thanks in advance

[Art_Campbell1]

Is there a reason you are not using the system variable "Modification Date?"

More direct than creating your own user variable, and system variables are present in all files -- they work automatically, but it may not update until you save the file, which confirms the modification.

[RaulM21]

There are two reasons for not using it:

1: My german boss oredered us to input the date manually. They doesn't understand that if you don't modify anything, mod.date doesn't changes.

2: If I make a change only at content, then the date is updated at content.fm but not at index.fm.

Thank you.

[Art_Campbell1]

1. Educate him. Point out that the system variable is intended to overcome human mistakes....

2. a. Either in one of your working files or In a new, separate file, create a unique paragaph tag -- ModDate, for instance --. Insert the Modification Date variable as the only content.

    b. Insert a cross-reference from your working file(s) to the ModDate para tag.

    c. Whenever you open and Save the file with the date-controlling variable, the change should ripple into all files that use that as the source for the cross-reference.

[RaulM21]

It's impossible to educate him, they are squared-head german. I'm from Spain, and only follow sentences, I can't direct communicate with them.

I'll try your tips tomorrow.

Thank you very much.