TagFormat is not working properly

[ischowam]

Hello

I am trying around with the ORIGINALDATE for quite a while now, but it is very confusing.
First of all I do not see the tag named ORIGINALDATE anywhere.
I see several tag-fields in my main apps (mp3Tag / MusicBee), which sound the same or at least similar, so that you could think, they are the same, but the are not.

mp3 Tag:
Here I need to create a custom-field only for displaying a value. In the list where I can select the value to be displayed I only find a field %original year%
Looking at the metadata after maintaining a file it is listed as "ORIGINAL YEAR"

MusicBee:
Here there is a field called "Originalyear" and it ends up in a tag "ORIGYEAR"

And both are different fields, as only one is displayed, depending on my displayFormat string

Code:

title.displayFormat={$title^^$#AudioDuration^       ^^$Origyear^[ ^ ]$#AudioFormat^  |  ^^}

Is ORIGINALDATE not such a common/standard tag as TITLE, ARTIST, ALBUM etc.? And isn't it handled more or less in the same way in all apps like TITLE, ARTIST, ....?