很多人都知道“癌癥”代表上午

“pm”是指下午

但是中午或午夜12點(diǎn)是“上午”還是“下午”？

頭突然堵住了嗎？

和小編一起看看怎么表達(dá)吧。

首先，讓我們了解一下12小時(shí)制。

the 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each . the first 12-hour period is designated as am；Night to noon。the second period，marked pm，covers the 12 hours from noon to midnight .

12小時(shí)制將一天中的24小時(shí)分為兩個時(shí)間段，每個時(shí)間段12小時(shí)。

第一個12小時(shí)時(shí)段指定為am(上午)：從午夜開始到中午。第二個時(shí)段標(biāo)為pm(下午)，從中午到午夜。

The abbreviations am and pm derive from Latin:

am和pm是從拉丁語縮寫來的

AM = Ante meridiem : Before noon

意思是在中午前

PM = Post meridiem : After noon

意思是在中午后

meridiem /m?'ridi:?m/ n.正午

Ante meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M.

Ante meridiem通常會寫成AM, am, a.m., 或者是A.M.

post meridiem會縮寫為PM, pm, p.m., 或 P.M.

Like many other sources, uses am and pm, but the other variants are equally correct and widely used.

大多數(shù)的時(shí)間書寫，就像世界日期及時(shí)間網(wǎng)一樣是使用am和pm的，但其他變體也同樣正確并被廣泛使用。

那么

中午12點(diǎn)、

午夜的12點(diǎn)

分別該怎么表示?

The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon (am) or after noon (pm). For example, the moment of midnight occurs precisely 12 hours after noon on the previous day and 12 hours before noon on the following day.

12小時(shí)制的主要缺點(diǎn)是人們普遍混淆了正午和午夜的縮寫：從邏輯上講，這兩個時(shí)刻都不能被定義為正午之前(am)或正午之后(pm)。例如，子夜的時(shí)刻發(fā)生在前一天中午12小時(shí)后，第二天中午12小時(shí)前。

However, most digital clocks and most sources, including , designate midnight as 12 am and noon as 12 pm. Although the precise moment of noon falls in neither category, the hour succeeding it, from 12:00:01 to 12:59:59, is clearly after noon.

然而，大多數(shù)數(shù)字時(shí)鐘和大多數(shù)時(shí)間源，包括世界日期及時(shí)間網(wǎng)，都將午夜定為12 am，中午定為12 pm。雖然恰好中午的那個時(shí)間點(diǎn)好像哪個類別都并不屬于，但從12:00:01到12:59:59的連續(xù)時(shí)間顯然是在正午之后。

To avoid any confusion when referring to the precise moment of noon or midnight, we recommend using the designations 12 noon and 12 midnight instead.

為了避免在提到中午或午夜對準(zhǔn)確時(shí)刻產(chǎn)生混淆，我們建議使用12 noon和12 midnight來代替。

所以

中午或正午 (noon) 通常叫做

12:00 p.m.

子夜或午夜 (midnight) 叫做

12:00 a.m.

美國國家標(biāo)準(zhǔn)與技術(shù)研究所

(National Institute of Standards and Technology，NIST)

給出答案：

meridiem 就是 noon，

正午十二點(diǎn)應(yīng)該表達(dá)為12:00 noon ，

而午夜十二點(diǎn)可以表達(dá)為12:00 midnight，

以方便區(qū)分。

不過，

12:00 midnight 的用法也比較模棱兩可，

因?yàn)樗鼰o法區(qū)分是某一天開始的午夜，

還是結(jié)束的午夜。

要想解決這個問題，

可以用00:00(zero o'clock)

來表示某一天開始的午夜。

今天的內(nèi)容都學(xué)會了么?

歡迎評論交流心得~