8:12<8:13? true
8:12<=8:13? true
8:12>8:13? false
8:12>=8:13? false
8:12<=>8:13? -1
8:12,8:13? max=8:13 min=8:12
8:12.is_between(8:13, 9:13)? false
8:13.is_between(8:12, 9:13)? true
-
8:13<8:13? false
8:13<=8:13? true
8:13>8:13? false
8:13>=8:13? true
8:13<=>8:13? 0
8:13,8:13? max=8:13 min=8:13
8:13.is_between(8:13, 9:13)? true
8:13.is_between(8:13, 9:13)? true