12:00AM和12:00PM各是什么时候

错了，应该是12:00AM是凌晨12点，12:00PM是中午12点。

这个才是正确的！我在洛杉矶，圣诞期间12：00am商场才关门！

上午十二点，下午十二点

维基百科：
It is not always clear what times "12:00 a.m." and "12:00 p.m." denote. From the Latin words meridies (midday), ante (before) and post (after), the term ante meridiem (a.m.) means before midday and post meridiem
(p.m.) means after midday. Since strictly speaking "noon" (midday) is
neither before nor after itself, the terms a.m. and p.m. do not apply.
However, since 12:01 p.m. is after noon, it is common to extend this
usage for 12:00 p.m. to denote noon. That leaves 12:00 a.m. to be used
for midnight at the beginning of the day, continuing to 12.01 a.m. that
same day.
不懂就不要装懂，害人害己

12:00AM是中午的那个十二点，12：00PM是零时