update timestamp inference

shixian.shi

2023-03-09 3ff9f5bf779f79750807d706c08b5b5c5943fca0

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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.