positive: "12PM 是中午<br>记得我刚来美国的时候,有门课程12PM开始。当时我问教授怎么晚上那么晚了还上课。他笑着说12PM是中午。<br>其实,中国人中分不清楚12AM和12PM的大有人在。我相信很多人把12AM当成是中午,12PM当成晚上。就168肯定就有很多人分不清楚。<br>规则参看:钱多多选股大赛规则截止日期: 11/15/2009 12:00am EST.<br>报名截止。<br>所以我在规则里面,尽量不用12,都用11:59啥的。<br>Are noon and midnight 12 a.m. or 12 p.m.?<br>This is a tricky question. The answer is that the terms 12 a.m. and 12 p.m. are wrong and should not be used.<br>To illustrate this, consider that ""a.m"" and ""p.m."" are abbreviations for ""ante meridiem"" and ""post meridiem."" They mean ""before noon"" and ""after noon,"" respectively. Noon is neither before or after noon; it is simply noon. Therefore, neither the ""a.m."" nor ""p.m."" designation is correct. On the other hand, midnight is both 12 hours before noon and 12 hours after noon. Therefore, either 12 a.m. or 12 p.m. could work as a designation for midnight, but both would be ambiguous as to the date intended.<br>When a specific date is important, and when we can use a 24-hour clock, we prefer to designate that moment not"
negative: 你可以从不同的角度分析啊~<br>24点和0点是同一时刻,区别是24点为前一天截止时间点,而0点则是下一天起点。 时刻是指某一瞬间,在时间轴上用点表示。对应的是位置、速度、动量等状态量。注意.<br>0点至12点是什么时间段是am?<br>12 pm 是中午十二点,12am 则是指早上0时,也就是晚上的12点。 早上 0点和午夜12点的时间是重叠的。 所以它们就统一用 am, 早晨0时,英语可以说 0:00 a.m ,也可.