Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
that's yesterday
Grammar usage guide and real-world examplesAlternative expressions(20)
that's yesterday's news
that's history
no longer applicable
obsolete
that's old news
that's a thing of the past
not relevant anymore
outdated
invalid
no longer valid
ceased to apply
superseded
not in effect
has expired
no longer workable
no longer usable
no longer valuable
no longer relevant
no longer implementable
no longer true
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
8 human-written examples
But hey, that's yesterday's news.
News & Media
"That's yesterday's breakfast".
News & Media
Ah well, that's yesterday's post.
News & Media
That's yesterday's story.
News & Media
That's yesterday's advice.
News & Media
; But that's yesterday's story.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
51 human-written examples
Pornography constructs who that is" (MacKinnon 1987 172).
Science
Jesus, that was ten years ago.
News & Media
Oh, that was last week.
News & Media
"That's next year's challenge".
News & Media
That's 2016's reading sorted, then.
News & Media
Expert writing Tips
Best practice
In journalistic writing, append a noun like 'news', 'story', or 'advice' to specify exactly what has become outdated.
Common error
Do not use "that's yesterday" in technical or scientific reports when you mean the literal previous calendar day; instead, use 'the previous day' or 'yesterday' without the contraction to maintain precision.
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that's yesterday" functions as a predicative clause where the subject 'that' represents a concept or event, and 'yesterday' acts as a temporal metaphor for obsolescence. In Ludwig, this structure is frequently found as a shorthand for 'yesterday's news' or 'yesterday's story'.
Frequent in
News & Media
75%
Wiki
15%
Informal
10%
Less common in
Science
5%
Formal & Business
3%
Academia
2%
Ludwig's WRAP-UP
The phrase "that's yesterday" is a vibrant example of how English speakers use time-related words to express value judgments on relevance. Ludwig AI data shows a strong preference for this phrase in media outlets where the speed of information is paramount. While it primarily appears as an abbreviated form of "that's yesterday's news", it stands alone effectively as a dismissal. Writers should favor it in contexts where a punchy, slightly informal tone is desired, but remain cautious of its metaphorical nature in strictly technical or literal documentation.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
that's old news
Specific to information or reports that are no longer surprising.
that's history
More emphatic, implying something is completely finished or gone.
that's a thing of the past
More formal and descriptive of a general trend or custom.
that was then
Commonly used in the contrastive idiom 'that was then, this is now'.
that's passé
Borrows from French to describe something no longer fashionable.
that's outdated
A more literal and clinical description of obsolescence.
that's so last year
Highly informal and often used in pop culture or fashion contexts.
that's water under the bridge
Implies a past event that is no longer worth worrying about.
that's water over the dam
A variation of the bridge metaphor, often used in American English.
that belongs to the past
More poetic or philosophical in tone.
FAQs
How to use "that's yesterday" in a sentence?
You can use it to dismiss an idea as no longer relevant, such as in the phrase: "In the tech world, "that's yesterday's news"."
What can I say instead of "that's yesterday"?
Depending on the tone, you could use "that's history", "that's outdated", or "that's so last year".
What is the difference between "that's yesterday" and "that was yesterday"?
The first is often a metaphorical dismissal of relevance, while "that was yesterday" usually refers to a literal point in time in the past.
Is "that's yesterday" too informal for business writing?
It is generally acceptable in business journalism or casual office communication, but in a formal report, it is better to use "no longer applicable" or "obsolete".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested