bug fix in timestamp inference

shixian.shi

2023-09-13 eb9989745e2dc9d2017dadeacfb167f59b35714b

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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.