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I found the following sentence on a website. I thought we could only use "on" when we addressing a date. Nevertheless, in the following sentence the preposition "at" is being used in a way that makes me confused. Therefore, I would be greateful if someone could let me know why they have used "at" in the following sentence instead of "on".


The context can help learners remember the language and recall it at a later date.


Reference :-

https://www.teachingenglish.org.uk/article/contextualisation

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dileepaI thought we could only use "on" when we addressing citing a date.

That's the rule for a specified date, not the rule for using the word "date".

on September 12
on June 23
on August 14, 1946

CJ

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dileepaat a later date.

It is a common set phrase, which means some non-specific point in time (a day) in the future. "At" is also used in formal contexts.

Here are more examples:

The judges will give their reasons for their decision at a date to be announced.

The Company does not hold any shares in Treasury at the date of this disclosure.

He may apply for the position at a future date by the usual means.

Arnulf was born to an important Frankish family at an uncertain date around 582.

If you are a repeat offender, we want you in jail at the earliest possible date.

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Thank you very much for the answer.

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