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I updated a cost sheet and I want to specify that it's a newly updated cost sheet. For this situation, which one is correct?

cost sheet as on/of 16 May

Before specifying a date, which will come first, on or of?

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They are both correct for different situations. For example, As on 16 May, he again failed to arrive at work on time. and As of 16 May he will have worked here for a full year. – Jim Jan 3 '13 at 7:14
@Athi - Research work means have you tried to search for the solution of your problem on the web or other sources? – Mohit Jan 3 '13 at 7:36
@Athi What we ask is that you describe the effort you made, and it is best to put that description into the question itself instead of comments. – MετάEd Jan 3 '13 at 7:41
up vote 1 down vote accepted

They are both correct but mean different things in different situations. As of May 16 indicates the start of something; from that time on, while as on May 16 is completely different. As in as on May 16 means such as; like and is used for comparison.

As of May 16, 2012 cigarettes are banned in this country.

As on May 16, he again failed to attend the conference.

Back to your specific example. In your case as of makes more sense because you want to say that the sheet covers cost from May 16 on.

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"as of" is the same as "as from": used to show the time/date from which something starts, e.g. As of/from Monday, we shall give all of you winning bonuses.

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