rename some functions

aky15

2023-04-17 b3b4c1bc5bb068c9aff99740e6257d12c6676ff7

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.