Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
On september
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "On September" is correct and usable in written English.
It is typically used to indicate a specific month when referring to an event or occurrence. Example: "On September 15, we will hold our annual meeting."
✓ Grammatically correct
News & Media
Encyclopedias
Alternative expressions(1)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
2 human-written examples
Elections will be held on September 5th.
News & Media
This was corrected on September 1st 2011.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
It expires on September 16th.
News & Media
On September 23 Palestinian Pres.
Encyclopedias
On September 10, Luciano had him murdered.
Encyclopedias
MULFORD--Myrtle E. on September 24 , 2011
News & Media
MARCUS--Beatrice on September 26 , 2011
News & Media
LEVINE--Morris on September 13 , 2011
News & Media
The application was refused on September 29.
Encyclopedias
BORGENICHT--Travis, on September 23, 2010.
News & Media
BROWNELL--Barbara Gay, on September 4, 2011.
News & Media
Expert writing Tips
Best practice
When using "On September", specify the exact date if precision is required; otherwise, "In September" may suffice for general references.
Common error
Avoid using "At September" or "From September" when specifying an event's timing within the month; "On September" or "In September" are the correct prepositions.
Source & Trust
84%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "On September" functions as an adverbial phrase of time, specifying when an event or action takes place. According to Ludwig, it is generally considered correct. It indicates a particular date within the month of September.
Frequent in
News & Media
50%
Encyclopedias
50%
Wiki
0%
Less common in
Formal & Business
0%
Science
0%
Academia
0%
Ludwig's WRAP-UP
In summary, "On September" is a grammatically correct prepositional phrase used to specify a particular date within the month of September. Ludwig AI indicates that it functions as an adverbial phrase of time, providing temporal precision in various contexts. While "On September" is considered correct and commonly used, "In September" is an alternative option, suitable for general references to the month. The phrase appears frequently in news articles, encyclopedias, and other neutral-register sources. The best practice is to use "On September" when specifying an exact date and "In September" for more general temporal references.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
In September
Uses a different preposition to indicate the same month.
During September
Emphasizes the duration of the month.
Throughout September
Similar to 'during September', highlighting the entire month.
Early September
Refers to the beginning of the month.
Mid-September
Refers to the middle of the month.
Late September
Refers to the end of the month.
September the fifth
Specifies a date within the month.
September of this year
Adds a temporal reference to the current year.
The month of September
More formal way of mentioning September.
Around September
Indicates an approximate time frame near September.
FAQs
How to use "On September" in a sentence?
Use "On September" to specify a particular date in September when something occurs. For example, "The meeting is scheduled for "On September 15"."
What can I say instead of "On September"?
You can use alternatives such as "In September" or "During September", depending on whether you want to emphasize a specific date or the entire month.
Which is correct, "On September" or "In September"?
"On September" is used for specific dates, while "In September" is used for general references to the month. For instance, "The event is "On September 5"" versus "The weather is usually pleasant "In September"".
What's the difference between "On September" and "During September"?
"On September" refers to a specific date, while "During September" refers to an event that occurs at some point throughout the month. Example: "The conference starts "On September 10"," versus "Preparations will take place "During September"".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.1/5
Expert rating
Real-world application tested