fix format error

yhliang

2023-05-10 555ca020b7075987f118657c2741d41c9963ad7f

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p.m.    PM
p.m    PM
pm    PM
P.M.    PM
P.M    PM
PM    PM
a.m.    AM
a.m    AM
am    AM
A.M.    AM
A.M    AM
AM    AM