AS AT or AS OF?

AS AT or AS OF?

by Arnold
(Brunei Darussalam)

I always use "as of" to indicate the latest update of my project or some certain issue, but my colleague always correct me by saying it should be "as at."

For example, "As at January 17, 2013" instead of "As of January 17, 2013."

I'm confused regarding which one is correct.

Please let me know what's correct and why.

Thank you.

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Mar 16, 2013
Answer
by: Chelsey

As a native English speaker, I would never say, "As at January 17, 2013…"

I would use the phrase, "As of January 17, 2013…"

"As of" is a preposition that means:
1. on
2. at
3. from

We use "as of" to talk about a specific date or time when something begins or ends.

Examples
1. The new rules will take effect as of the morning of July 1, 2012.
2. As of Monday morning, I will no longer be working there.
3. As of 9:00 a.m. she had completed three of the five assignments.

"As at" is not a proper preposition and should not be used.

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