Display fields from a paragraph as a single field
If you wish to have absolute control on the display of your date range, I'd recommend you to create a module with a new FieldFormatter to expand one of the DateRange fieldformatters (the original files are in code/modules/datetime_range/src/Plugin/Field/FieldFormatter).

By overriding the viewElements() function, you'll be able to set the desired display(s) for your date range from one place and independent from the site theme files.

Once your new fieldformatter file is created, go to your paragraph "manage display" page and modify the display of your date range field to your new fieldformatter.

Hope this helps.