was effective as of

USAGE SUMMARY

The phrase "was effective as of" is correct and usable in written English.
You can use it when discussing when a certain policy, decision, or rule began to be effective. For example, "The new safety regulations were effective as of March 1st."

✓ Grammatically correct

News & Media

Science

Human-verified examples from authoritative sources

Exact Expressions

2 human-written examples

His appointment was effective as of Wednesday.

The New York Times

Mr. Myat's leave was effective as of Tuesday; Mr. Lopes da Silva will go on leave on Nov. 17, the spokesman said.

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

57 human-written examples

But it's effective as well: a way of reconciling creator with character.

The New York Times - Arts

They would be effective as of Wednesday.

The New York Times

The moves are effective as of Jan . 1 , 2010

The New York Times

The policy is effective as of now.

TechCrunch

The Time Inc. job cuts are effective as of Dec. 31.

Forbes

The extension of the plan is effective as of Oct. 1, 2004, and may be extended thereafter.

Forbes

Hall's resignation is effective as of today, Fox 5 San Diego reports.

Huffington Post

The medication was effective, as part of an overall programme of behaviour management.

The Guardian - Opinion

In this experiment, however, the 5α-reductase inhibitor was effective, as the turnover of P to allopregnanolone was significantly reduced.

Plosone

Expert writing Tips

Best practice

When using "was effective as of", ensure the date is clearly stated to avoid ambiguity about when the policy, rule, or decision took effect. For example, "The new policy was effective as of January 1, 2025."

Common error

Avoid using "was effective as from" as it is redundant. The phrase "as of" already implies a starting point, so "from" is unnecessary. Stick to "was effective as of" for clarity.

Linguistic Context

The phrase "was effective as of" functions as an adverbial phrase indicating the point in time when something became operative or valid. It specifies the starting date for a policy, rule, or any decision. Ludwig AI confirms its grammatical correctness and usability.

Expression frequency: Rare

Frequent in

News & Media

66%

Science

33%

Formal & Business

0%

Less common in

Academia

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

The phrase "was effective as of" is a grammatically correct and usable phrase that functions as an adverbial phrase, specifying the starting date of a policy or rule. Ludwig AI confirms its correct usage. It's most frequently found in News & Media and Science contexts. While rare, it's a precise way to communicate when something came into force. When using this phrase, ensure the date is clear and avoid redundant phrasing. Alternatives like "became effective on" or "came into effect as of" can also be used. Top authoritative sources using this phrase include The New York Times and Forbes.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

Became effective on

Focuses on the action of becoming effective rather than stating a past state.

Came into effect as of

Uses a more formal tone to describe the start of effectiveness.

Took effect from

Highlights the moment the effect started from a specific time.

Was implemented starting

Emphasizes the implementation process and when it began.

Started being valid on

Focuses on the concept of validity and the commencement date.

Is now in force since

Indicates a current state of being in force from a past date.

Began to apply from

Highlights the action of applying and the starting point.

Took effect immediately on

Emphasizes the immediacy of the effect taking place.

Has been in effect since

Focuses on the continuous state of being in effect from a certain date.

Was operative from

Uses a more formal word 'operative' to indicate when something started working.

FAQs

How can I use "was effective as of" in a sentence?

Use "was effective as of" to indicate the specific date when a rule, policy, or change began to be in force. For example, "The new regulations "were effective as of" yesterday".

What's a more formal alternative to "was effective as of"?

A more formal alternative is "came into effect as of". For instance, "The amendment "came into effect as of" the date of ratification".

Can I use "was effective from" instead of "was effective as of"?

While "was effective from" is sometimes used, "was effective as of" is more precise as it specifically denotes the starting date. It's better to avoid "was effective from" to ensure clarity.

What is the difference between "was effective as of" and "is effective as of"?

"Was effective as of" indicates that something began to be effective at a specific date in the past, whereas "is effective as of" indicates that something is currently effective from a certain date. For example, "The law "was effective as of" 2020 (but is no longer)" vs. "The law "is effective as of" 2020 (and remains in force)".