fix h5 for timestamp change (#880)

zhaomingwork

2023-08-21 ca0ada5915b4c71fc4a30db689e0e3646181aebf

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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.