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In Mini-Lesson #35 from The Writing Lab's 101 Grammar Mini-Lessons series, we focus on the correct use of commas in dates and geographic units. Key rules include using commas to separate each item in a date from the rest of the sentence and in geographic locations. For example, when writing “December 8, 1941, the U.S. and Britain declared war on Japan,” commas play a crucial role. We also cover important exceptions regarding adjective usage and date formats. Enhance your writing skills with these essential grammar tips!
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Commas in Dates and Geographic UnitsMini- Lesson #35From the Writing Lab’s 101 Grammar Mini-Lessons Series
On December 8, 1941, the U.S. and Britain declared war on Japan. Use a comma to separate each item in a date from the rest of the sentence.
Use a comma to separate each item in a geographic unit from the rest of the sentence.The German blitz against London, England, resulted in widespread destruction.
If the date is used as an adjective, do not place a comma after the year.The December 7, 1941 bombing of Pearl Harbor is an event that will live in infamy.
Do not place a comma after the parts of a date when only two units (the month and day or the month and year) are used.June 6, 1944, is the day on which allied forces invaded France during World War II.June 6 is the day on which allied forces invaded France during World War II.
The Battle of Iwo Jima took place in February 1945. If only the month and year are used, the comma is often omitted.