support for turning off timestamps

lzr265946

2023-02-10 7aa2e885f41829e5148ed3be44d3ebb43e04ff40

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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.