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
which time since
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "which time since" is not standard in written English and may cause confusion. It could be used in contexts discussing a specific time period or event, but it is better to rephrase for clarity. An example could be: "I have been working here, which time since I graduated." Alternative expressions include "since that time" and "from that point onward."
⚠ May contain grammatical issues
Academia
Science
News & Media
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
2 human-written examples
In a final HLM model, in which time since entry, a baseline time indicator, age, gender, education and Mini-mental State Examination score were controlled, subjective social support, instrumental ADL impairment, subcortical gray matter severity, and the interactions of time with social network and with subcortical gray matter lesions remained significantly associated with MADRS score.
Academia
3– 5 Using self-report as a measure of true prevalence, however, may be questionable owing to recall bias, especially in retrospective studies, in which time since the last SA relative to self-report and early gestational age at SA were both associated with higher risk of reporting errors.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
IESE has offered its Advanced Management Program in Munich since 2005, since which time it has launched several more open and in-company programmes.
News & Media
The group has been on hiatus since May 2011, since which time both Matthew and Eleanor have pursued solo careers.
News & Media
Industrial growth was given great impetus during World War II, since which time its population has more than trebled.
Encyclopedias
The decision in that case was made nearly 30 years ago, since which time the lower federal courts have almost unanimously followed the rule there stated.
Academia
In 2001, Hillfields was a battleground for race riots, since which time further tensions have greeted arrivals from Iraq, Africa and eastern Europe.
News & Media
On Monday Matt Emmens, Shire's chief executive, bought $200,000£111,00000) of shares in the company, since which time they have risen about 5% in value.
News & Media
From the middle of 2009, responsibility for them was transferred to the Iraqi authorities, since which time their future has become increasingly uncertain.
News & Media
The last research-based book to study the bishops of the United States came out in 1989, since which time the Church has gone from Pope John Paul II to Benedict XVI to Pope Francis and undergone dramatic shifts.
Academia
South Ave . w. of baseball field, a few plants, 1918 (L. F. Randolph), since which time it has persisted; library slope, 1923 (W. C. Muenscher) railroad near Barge Canal Terminal, 1925 (Muenscher) ; dump, lighthouse road, 1925 (Muenscher) ; w. of bridge, Montezuma, 1925 (Muenscher).
Academia
Expert writing Tips
Best practice
When discussing the passage of time from a specific event, use clearer and more grammatically accepted phrases such as "time elapsed since", "period since", or "duration since" instead of "which time since" to avoid confusion.
Common error
Avoid using "which time since" in formal writing. This phrase is often perceived as grammatically incorrect or awkward. Opt for alternative phrases that provide better clarity and are more commonly used.
Source & Trust
83%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which time since" functions as a relative clause introducing a time frame. Although sometimes used, its grammatical correctness is disputable, according to Ludwig AI. It often seeks to define a period relating back to a specific event or starting point.
Frequent in
Science
30%
News & Media
30%
Academia
20%
Less common in
Wiki
10%
Encyclopedias
5%
Formal & Business
5%
Ludwig's WRAP-UP
In summary, the phrase "which time since" aims to define a duration or interval related to a specific event. However, Ludwig AI indicates that the phrase may be grammatically incorrect or awkward. Alternative phrases like "time elapsed since" or "period since" provide greater clarity and are more grammatically sound. Although "which time since" appears across varied source categories like Science, News & Media and Academia, it is relatively rare and should be used with caution, particularly in formal contexts.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
time elapsed since
Replaces "which time since" with a more direct and grammatically standard phrase.
period since
Focuses on the duration from a specific event or point in time.
duration since
Emphasizes the length of time that has passed.
time since then
Adds a clarifying "then" to specify a reference point.
interval since
Highlights the space of time between two points.
how long since
Presents the phrase as a question inquiring about the duration.
since which moment
Emphasizes a particular point in time as the starting point.
from that time onward
Indicates a continuation of time from a specific event.
following that time
Highlights the sequence of events after a specific time.
subsequent to that time
Uses a more formal tone to denote the time after a specific event.
FAQs
What is a more grammatically correct alternative to "which time since"?
Instead of "which time since", consider using phrases like "time elapsed since", "period since", or "duration since" for better clarity and grammatical correctness.
In what contexts is it best to avoid using "which time since"?
"Which time since" should be avoided in formal writing, academic papers, and professional communications. It is generally preferable to use more standard English phrases to ensure clarity and avoid potential grammatical errors.
How can I rephrase a sentence containing "which time since" for improved readability?
To improve readability, replace "which time since" with more direct expressions. For example, instead of "...by which time since the event...", try "...by the time that had elapsed since the event..." or "...the period following the event...".
Is "which time since" considered grammatically incorrect?
While it may appear in some contexts, "which time since" is often considered non-idiomatic and can lead to awkward phrasing. It is generally better to use alternative expressions like "the time that has passed since" or "the interval since".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
2.8/5
Expert rating
Real-world application tested