Merging 2 date fields for display

Hello,
i am working on a drupal 8 website, and i would like to merge to date fields so it does not display the month twice,
for exemple:

22-23 march

instead of

22 march , 23 march

i don’t know how to do this, can anyone help ?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/4/feed