Use actual year or take actual year from PC

I would like to use actual date as a variable in mp3tag, I use it to compare how old is a song and order it (2017 less file year)

Now I have a variable called %DATE_NOW% but I have to write it by myself everytime I use it.

I would like to know if mp3tag has it or if I can take it from my computer.

Thanks.

The actual date is a Mp3Tag-variable called %_date% or %_datetime%.

Thank you!