Add sentence timestamp support

dingbig

2023-02-22 bea5d984233aae08d7b9f6a3e8a3f309fae581ad

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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