What are you if..elsif attempts? There are two cases -- one where start<=end and the other where end<start (the "overnight" window, where 10pm is before 4am). Here is pseudocode for an if ladder:

# WARNING -- it's left to the reader to properly compare the values (c
+an't do '01:40' < '01:30')
if start <= end
  return 1 if start <= t and t <= end
else   # end < start
  return 1 if  ( start <= t and t <= 23:59 ) or ( 00:00 <= t and t <= 
+end )
endif
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