I would like to suggest adding somewhat revolutionary feature to the Mp3tag: ability to change dates of files. I am thinking here especially about the %_file_mod_date% parameter
This function is already there. Under the Tools > Options > Tags > Tags there is this checkbox "Preserve file modification time when saving tags". So Mp3tag has that ability and gives the user the choice to preserve or actualize the time stamp of a file. How about if the user would want to change it on purpose- but to a selected date and / or time; to antedate?
I personally preserve %_file_mod_date% parameter intact but I also antedate every couple of days few files; because I use certain dates for distinction between certain files. I tells me vital information if the file is from before 2014 or after 2016 etc.; but sometimes I have to "cheat" so that my system would not fell apart with non unified or false data, even if it would be just a single file. And in order to do that I have to use third party software like the free FileDate Changer [by Nir Sofer]- and then to be sure also check in the Mp3tag if the changed did really occur and without errors on behalf of the user. And that is a lot of additional clicking
Mp3tag could simply allow to write the needed data in form YYYY-MM-DD and / or HH:MM:SS [or whatever order a given OS uses], both in Tag Panel and Column and as well with actions. And that would be the restriction: data would have to fit such masks [are they called?] in order to be accepted. Typing of illegal signs or other errors would end up user simply without any change taking place. This could be some sort of advanced setting, that would need to be first turned on in the Options- just like the current preservation of modification time or its lack of via the that aforementioned check box