Add sentence timestamp support

dingbig

2023-02-22 bea5d984233aae08d7b9f6a3e8a3f309fae581ad

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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.