Thank you for your post!
I'm sure there are a handful of ways to do this. You might use an appropriate Script Trigger to automate what you currently do manually. The script itself might include a Set Variable to hold the Date Field of the Current Layout, then a Go To Layout (to go to the second layout), a Set Field (to the Variable), and finally another Go To Layout to return to the Layout you started on.
I am also going to move this thread from the FileMaker Community Feedback Space, which is specifically for input on the Community itself, to the Discussions Space where you should receive more views and potentially more (and better) feedback on this topic!
We need to know more than just that you have two layouts. What do you have as tables and how are they linked in relationships? Are they linked in relationships?
It's entirely possible that you might be able to remove one of these two date fields and just use one field on both layouts--there by simplifying your database design.
I have a very rudimentary solution with no relationships right now. What I came up with for the solution was your second suggestion, I think. I just used the same field on the other layout but called it something else. However, we are also looking into using Domo and this may not be an option as they actually should be two separate fields even though the date in the two fields is the same.
thank you for your response.