fix bug in timestamp inference

shixian.shi

2023-09-13 33a9bafbcc7469e4106fb3c5b29180f35cf982a3

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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.