Airports that have no control tower are colored in magenta. Airport #1 Big Cypress has class G surface up to 699 ft class E starts at 700 within the magenta shading around airport. Outside of the magenta shading the class E starts at 1200 ft. In Airport #2 Dade Collier, the dashed magenta indicates class E starts at surface and on outside of dashed magenta line class E starts at 700 ft up to the magenta shading and outside of magenta shading class E starts at 1200 ft.
In Witham you have dashed blue line indicating class D airspace from surface, outside of dashed blue line you have class E starting at 700ft to the magenta shading, outside of magenta shading class E starts at 1200 ft.
Class D airspace is part time as opposed to 24 hrs, so when the tower closes class D airspace turns either class E surface within the dashed line or class G surface within the dashed lines. Whitham in this example turns into class G surface within the blue dashed line.
Remember that just because a class D airspace turns to class G airspace after tower closes does not mean planes will stop landing or taking off. They will self announce on the CTAF. If you don’t have radio and would like to listen you can get this app. Keep in mind there is about a 5 to 7 second delay from actual radio transmission. Listen to Live ATC (Air Traffic Control) Communications | LiveATC.net