when did that happen

USAGE SUMMARY

The phrase "when did that happen" is correct and usable in written English.
You can use it to inquire about the timing of a specific event or occurrence that has been mentioned or discussed. Example: "I just heard about the new policy change. When did that happen?"

✓ Grammatically correct

News & Media

Academia

Wiki

Human-verified examples from authoritative sources

Exact Expressions

31 human-written examples

"I used to keep thinking, 'When did he decide to make it up that I wasn't his son, when did that happen?' And then eventually I just thought, 'You're never going to find out, and, actually, why am I trying to reason with someone who's unreasonable and I believe was mentally ill?' It wasn't just rage, it was someone who wasn't dealing with a full deck.

The Guardian

"When did that happen?

The New York Times - Sports

When did that happen?" Scalia asked.

The New Yorker

But when did that happen?

The Guardian - TV & Radio

"When did that happen?" I asked.

The New Yorker

When did that happen?" Christmas Eve.

The Guardian - Sport

Human-verified similar examples from authoritative sources

Similar Expressions

29 human-written examples

DACHER KELTNER When does that happen?

University of California, Berkeley

And Ohio — when does that happen?" asked P.G.

The New York Times

"When does that happen?" Richard Belzer provides some context: "They came along at a time, right after World War II, no one was ever that anarchic.

The New York Times - Arts

When does that happen?

HuffPost

How does a point of view become policy and when does that happen?

Huffington Post

Expert writing Tips

Best practice

Use "when did that happen" to express surprise or a need for clarification about a past event, especially when the timing is unexpected or unknown to the speaker.

Common error

Avoid using "when did that happen" when you already know the approximate time frame; it's best suited for situations where you genuinely lack information or are expressing disbelief.

Linguistic Context

The phrase "when did that happen" functions as an interrogative expression. As supported by Ludwig, it's used to inquire about the timing of an event, usually expressing surprise or seeking clarification. It introduces a question about a past occurrence.

Expression frequency: Very common

Frequent in

News & Media

59%

Academia

15%

Wiki

7%

Less common in

Science

7%

Formal & Business

0%

Encyclopedias

0%

Ludwig's WRAP-UP

The phrase "when did that happen" is a common and grammatically correct way to ask about the timing of an event, as confirmed by Ludwig. It typically indicates surprise or a need for clarification. Appearing frequently in News & Media, Academia and Wiki sources, it maintains a neutral register suitable for various contexts. While versatile, it's best used when genuinely unaware of the timing, and formal settings may benefit from alternatives. Ludwig AI's analysis reinforces its role as a practical and widely understood interrogative phrase.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

When exactly did that occur?

Adds emphasis to the desire for a precise time.

At what point did that take place?

Replaces "happen" with a more formal "take place".

When did this come about?

Focuses on the origin or beginning of the event.

How long ago did that happen?

Shifts the focus to the duration since the event.

What was the date that occurred?

Seeks the specific date of the occurrence.

When did this start?

Simplifies the inquiry to the beginning of something.

What's the timeline for that?

Asks for a sequence of events related to the topic.

On what date did that transpire?

Uses a more formal and less common verb.

When did it begin?

A more concise way of asking about the start of an event or situation.

Can you specify when that happened?

Requests a specific clarification of the timing.

FAQs

How can I use "when did that happen" in a sentence?

You can use "when did that happen" to express surprise or seek clarification. For example, "They announced new budget cuts. "When did that happen"?"

What are some alternatives to "when did that happen"?

Alternatives include "when exactly did that occur?", "at what point did that take place?", or "how long ago did that happen?" depending on the nuance you want to convey.

Is it appropriate to use "when did that happen" in formal writing?

While grammatically correct, "when did that happen" is generally more suitable for informal contexts. In formal writing, consider alternatives like "At what time did that occur?" or "When exactly did this event transpire?"

What's the difference between "when did that happen" and "when does that happen"?

"When did that happen" refers to a specific event in the past, while "when does that happen" refers to a recurring event or a general pattern.