Qustion about :datestr a bug? or something others

Why

datestr('2011-01-02 00:00:01','yyyy-mm-dd HH:MM:SS AM')

result in 2011-01-02 12:00:01 AM otherwise 2011-01-02 00:00:01 AM???

On the other hand, datestr('2011-01-02 12:00:01','yyyy-mm-dd HH:MM:SS AM') result in 2011-01-02 12:00:01 PM other than 2011-01-02 00:00:01 PM?* Is there a bug? or I had made a mistake?

[Oleg Komarov]

Puzzling...

Answer 1

[Jan]

The time 12:00 is called "12 PM", not "0 PM". This is a convention - but a confusing one and not everybody follows it. See: WikiPedia: 12 hour clock.

[Du Xiao]

Thank you very much for your help. Thank you a lot.