Is it possible to modify the data of the Tags: START DATE and END DATE with an Actions command?

[Sergius]

@LyricsLover

No, you can only select 1 target field at a time.
There are a few special "Fields" like _ALL or _TAG, but you loose control over what fields will be changed.

Source

@ohrenkino

Not in this action type. You could use "Guess value" as described here:

Just to add the "Guess value" example:
Action: Guess value
Source: $replace(%_directory% == %_filename% === %album%, '('Album')',, '('Digital Album')',, '('EP')',, '('LP')',, '('Single')',)
String: %_directory% == %_filename% === %album%

There is no guarantee that it actually works with this combination of fields as I still suspect that you have to run actions that manipulate the folder name in a different action group.

(just this post as example, the rest of the thread does not help)

@Combining 'replace with' [empty] in multiple fields action

%album%, '('Album')',, '('Digital Album')',, '('EP')',, '('LP')',, '('Single')',)...

Thanks @ohrenkino for this fairly detailed information. @LyricsLover also wrote me some examples.

Ohrenkino, I'm working on some of my tags with ('Album') ('EP') ('LP') ('Single')

If one day I need to program this type of data with Actions, I'll run some tests. If it doesn't work, I'll write on the Mp3tag Community to see if we can program them.

Thanks for your help, Ohrenkino, and the other volunteers too, and Florian, who gives us great updates with new features that sometimes impress me...