The app says the challenge runs from "June 1 to June 30" (not "through" June 30). It also says the challenge "ends in 3 days" (currently it is June 26). So does that mean miles run on June 30 will not count toward the challenge which really ends after 11:59 pm June 29?
Should be 30th inclusive. My app shows "Ends in 4 days" (today is 26th), and also "Ends Tuesday" (on the list of all Challenges). Both of it refers to 30th, as well as the description of the badge telling "Join this challenge and record 100 miles of running activities in June". As far as I know the 30th June is still in June 
