In MC the [Day], [Month] and [Year] Tags/Fields are all Sub-Sets of the [Date] Tag/Field and the [Date] field/tag will only ever accept a Legitimate Calendar Date. In addition if you change any one of those 4 fields that change will automatically be reflected in the other 3.
If the tag/field you have been putting things like 2001-2003 or 2021/2022 in is not called "Date" then you can add that tag/field to the ones MC Knows/Uses by using Tools >> Options >> Library & Folders >> ... Manage Library Fields >> Add New Field Option.
If it does have the name "Date" then there is no way it's content can be imported into, or used by, MC so you will have to use the above option to add in a New Field that has a suitable name, i.e. Date (Performance or Orig Recorded) with it's Edit Type set to String, and manually input the relevant information/values using the MC Tag Editior and not MP3Tag.
There is a reason why I used naming the tag/field - "Date (Performance or Orig Recorded)" above as that is one of the tag/field names the ET Track-Info Plugins recogises/uses (
https://yabb.jriver.com/interact/index.php/topic,134776.0.html ), which also happen to be the onlyTrack-Info Plugins designed for use with Classicsl Music.