You should always capitalize months and weekdays in English grammar. This is because they are proper nouns. A noun is the term we use for the names of people, places, things, and ideas. Nouns can be either common or proper.
Proper nouns are the names we give to specific people, places, things, and ideas. When we use them in writing, we always capitalize them:
In English grammar, we consider months and weekdays specific things, so they are proper nouns, and we capitalize them.
Do you know this rhyme to help you remember the number of days in each month? Each month has a specific name, so it’s capitalized:
Did you ever watch Happy Days on TV? Do you remember the theme song lyrics by Gimbel and Fox?
Each day has a specific name, making it a proper noun, so we capitalize it.
Common nouns are the names we give to unspecific people, places, things, and ideas. When we use them in writing, we capitalize them only sometimes.
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Take the Friends theme (Crane, Kauffman, Skloff, and Willis), which has the line:
It doesn’t refer to specific days or months, so we don’t capitalize those nouns. You should only capitalize these words if they appear at the beginning of a sentence or in a title.
English grammar considers seasons common nouns, since they refer to a general period instead of a specific day or month. We, therefore, only capitalize seasons if using them in a title or at the beginning of a sentence:
You should always capitalize specific names of months and weekdays, such as “August” or “Tuesday,” because these are proper nouns. You should never capitalize generic terms, such as “week” or “summer” – unless they begin sentences or appear in a title – because they are common nouns.
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