@ks185332 - Please check this…
DateTime.ParseExact("June 6, 2021", {"MMMM d, yyyy","dd MMMM yyyy, hh:mmtt PST","MMMM dd, yyyy hh:mm tt PT"}, new CultureInfo("en-US"),DateTimeStyles.None).tostring("MM/dd/yyyy")
For the 2nd and 3rd dates, you have to replace th,rd,nd and st values before passing to the above code…
Hope this helps…