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".

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Reference :-


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


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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