1、年 指年份用year，指年数可缩写成yr，不引起歧义时也可以写y 。
2、月 m ，日 d ，时 hr或h ，分 min ，秒 sec或s。
拓展资料
year
1、The year was 1840
那是1840年。
2、The twins didn't have to repeat their second year at school.
这对双胞胎不需要重读二年级。
3、The first years and second years got a choice of French, German and Spanish.
一年级和二年级学生可以在法语、德语和西班牙语中选一门。
4、He announced big tax increases for the next two financial years
他宣布在接下来的两个财年里将大幅提高税收。
5、I haven 'laughed so much in years
我很久没这么畅快地笑过了。
month
1、The trial is due to begin next month.
审判将于下个月开始。
2、She was here for a month
她在这儿呆了一个月。
3、Over the next several months I met most of her family
在后来的几个月里，我见到了她的大部分家人。
4、A new constitution was promulgated last month.
上个月颁布了一部新宪法。
5、Last month he signed a new non-aggression pact with Germany
上个月，他与德国签订了新的互不侵犯条约。
day
1、日已西斜。
The sun declined toward the west.
2、二十四小时为一日。
Twenty-four hours make a day.
3、一年三百六十五日。
There are three hundred and sixty-five days in a year.
4、我收到了你11月7日的来信。
I received your letter of November 7.
5、我们已经把索赔期限延长到了7月30日。
We have extended the time limit for claims until July 30.