Customize Event Details Labels

I would like to add some text to the Date/Time areas or maybe I have the date and time output in 1 field Example Jan. 3 @ 6pm.

See a screenshot of the area I am talking about – https://i.imgur.com/dZcnDud.png

Also this section which is the grid view in classic – https://i.imgur.com/tkXP5rT.png