January——Jan． January February——Feb． February

March——Mar. March April——Apr. April

August——Aug. August

September——Sept. September

October——Oct. October

November——Nov. November

December——Dec. December

Note: The dot after the abbreviation here cannot be omitted, because it is a symbol that represents the abbreviation.

C. Dates are expressed with the definite article the and the ordinal number. On which day to add the preposition on.

National Day is on Oct. 1.

National Day is on October 1st. (pronounced October first)

This sentence can also be expressed as National Day is on the 1st of October.

May 5 May fifth (pronounced May fifth)

Can also be expressed as the fifth (5th) of May

Mar. 1 (st) March 1st (pronounced March first or the first of March)

1. The century can be expressed by the definite article plus the ordinal numeral plus century, or it can also be expressed by the definite article plus the hundreds digit. \'s means

the sixth (6th) century AD six centuries

the eighteenth (18th) century AD eighteenth century

the 1900\'s two Tenth century

the 1600\'s Seventeenth century

Here, the century expressed as a hundred-digit integer is one more century than the hundred-digit Arabic numeral itself.

2. The era is composed of the plural form of the century plus ten integers expressed by the definite article and the cardinal number

in the 1930\'s (in the thirties of the twentieth century or in the nineteen thirties)

in the 1860\'s (in the sixties of the 19th century or in the eighteen sixties)

In the 1860s

In the 1870\'s when Marx was already in his fifties, he found it important to study the situation in Russia, so he began to learn Russian．

In the 1870s, when Marx was already in his fifties, he found it important to study the situation in Russia and began to learn Russian.

3. To express the early, middle and late years of a certain era, you can add early, mid-, late after the definite article and before the era

in the early 1920\'s Early 1920s

in the mid-1950\'s In the mid-1950s

4. Year, month and day notation

A. Years are represented by cardinal numerals, usually written as Arabic numerals. They can be read in hundreds, centuries, or years.

1949 is pronounced nineteen hundred and forty-nine or nineteen forty-nine

1800 is pronounced eighteen hundred

253 is pronounced two hundred and fifty-three or two fifty-three

1902 is pronounced nineteen hundred and two or nineteen o two

to indicate which year it is in. Generally, the preposition in is added before the number of years. When using year, year is placed before numerals.

in the year two fifty-three B.C. In 253 BC

However, in plus Arabic numerals are usually used to express the year.