how do i add the st,nd,rd or th at the end of a date month?

so when using os.date I want it to print something like this : --> August 25th the code I am using right now is :

print(os.date("%B %d", os.time()))

the problem with this is that it prints August 25 and not August 25th anybody know how to get the "st", "nd", "rd", or "th" at the end of a month date