How to insert data from another subfield into an additional field in Wordpress?

Question

Frontend

There is 1 post and 2 post.
How to call the data in the date 2 field of the post from the additional field date 1 of the post?

Answer 1

You have a question, of course. Where is this field called, on which page?
Calling data in the second field does not work, you need to get the value of the first field when loading the second post and write it to the second field. The only question is, what for in general so dress up?