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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
a date at which
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a date at which" is correct and usable in written English.
It can be used when specifying a particular date related to an event or occurrence. Example: "We need to finalize a date at which the meeting will take place."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(20)
a date on which
a date when
a time when
the date that
a specific date for
the date upon which
the occasion when
a deadline of
a pistol at which
a maximum at which
a price at which
a lawyer at which
a point at which
a show at which
a funeral at which
a hearing at which
a banquet at which
a limit at which
a value at which
a length at which
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
10 human-written examples
Under Greyrock's new "price protection" program, buyers closing on one of its houses may negotiate a date at which the home will be reappraised.
News & Media
Union officials have long believed that Bettman and the owners had a date at which they planned to change tactics and begin pursuing an agreement.
News & Media
Investors pick a date at which they plan to withdraw their money — typically the year they plan to begin retirement — and the fund manager handles all the investment decisions, shifting to more conservative investments as the due date draws nearer.
News & Media
It is possible that the Marquesas were settled as early as the 2nd century bce, rather than 300 ce, a date at which settlements may have occurred in Hawaii.
Encyclopedias
Suppose that at some future date — a date at which private demand for funds has revived, so that there are lending opportunities — the US government has committed itself to spending equal to 27 percent of GDP, while the tax laws only lead to 17 percent of GDP in revenues.
News & Media
There is, in the future, a date at which these companies expect to stop consuming cash to operate.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
50 human-written examples
A "to" approach adjusts the allocation up to a target date, at which time it becomes finalized.
News & Media
All providers were given the CKD guideline reference card; providers unable to attend a lecture were given the CKD reference card at a later date at which time the content of the lecture was briefly discussed.
However, when pressed by colleagues, MPs said she carefully avoided offering a specific date at which she would resign.
News & Media
While it is true that individual bonds have a maturity date at which you are assured of receiving back your principal (all other things being equal), that is not true with bond funds.
News & Media
She is awaiting a court date at which she hopes he will be ordered to pay child support, she said.
News & Media
Expert writing Tips
Best practice
Use "a date at which" when you need to specify a formal agreement or plan contingent on a particular date. It provides a sense of precision and commitment.
Common error
Avoid using "a date at which" in casual conversations or informal writing. Simpler alternatives like "a time when" or "the date that" are often more appropriate and sound less stilted.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a date at which" functions as a prepositional phrase, modifying a noun (usually "date" or a similar temporal noun) by specifying a condition or event linked to that particular date. Ludwig's examples show how this phrase introduces details related to actions and plans.
Frequent in
News & Media
40%
Science
30%
Encyclopedias
10%
Less common in
Wiki
10%
Academia
5%
Formal & Business
5%
Ludwig's WRAP-UP
In summary, "a date at which" is a grammatically correct prepositional phrase used to specify a particular point in time when an event is planned or a condition will be met. While not overly common, as indicated by Ludwig, it is most frequently found in news and media sources, as well as in scientific contexts. The phrase carries a formal tone, making it more suitable for professional communications or situations where precision is required. When aiming for simplicity in everyday writing, consider alternative phrases like "a time when" or "a date when".
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a time when
Replaces "at which" with a more common and simpler temporal conjunction.
a date on which
Substitutes "at which" with "on which", providing a slightly more formal alternative.
a specific date for
Uses a more direct construction, focusing on the purpose of the date.
the date upon which
Offers a more formal and emphatic version using "upon which".
the point in time when
Replaces 'date' with 'point in time', making it less specific to a calendar date.
the occasion when
Shifts the focus from a specific date to an event or occasion.
a deadline of
Implies a due date or a final date for something.
a scheduled time of
Focuses on the planned aspect of the date or time.
the designated day for
Emphasizes the act of assigning or selecting a date.
a future juncture where
Introduces a more abstract sense of time and condition.
FAQs
How can I use "a date at which" in a sentence?
You can use "a date at which" to specify a particular date related to an event or decision. For example, "We need to determine "a date at which" the contract will be signed."
What's a simpler way to say "a date at which"?
Alternatives include "a time when", "a date on which", or "the date that". The best choice depends on the context.
Is "a date at which" too formal for everyday writing?
While grammatically correct, "a date at which" can sound formal. Consider using simpler alternatives unless the context requires a more formal tone.
What is the difference between "a date at which" and "a date when"?
Both phrases indicate a specific point in time, but "a date at which" carries a slightly more formal tone compared to the more commonly used and straightforward "a time when" or "a date when".
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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
4.5/5
Expert rating
Real-world application tested