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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
on either date
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "on either date" is correct and usable in written English.
It can be used when referring to two specific dates and indicating that something applies to both. Example: "You can schedule the meeting on either date that works best for you."
✓ Grammatically correct
Science
News & Media
Wiki
Alternative expressions(17)
on one of those days
on each of those days
on either day
on either side
on the aforementioned dates
on both occasions
on either of the two days
on either occasion
on the specified days
on a particular day
on the respective dates
on both day
on both dates
on any of the days
on the day in question
on the specified dates
on both days
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
1 human-written examples
Since a considerable mass of his notes were incomplete and/or ambiguous on either date or task, this allowed Laidlaw to tell the jury that there were only 12 occasions when it was 100% certain that Mulcaire had hacked a phone while she was editor – an eye-catching point to be able to deliver in answer to the crown's inference.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
The follow-up period started from the date of diagnosis and ended on either the date of death or the date of the last follow-up.
The Charlson index was recalculated on either the date of bleed or a random observed date for the bleed and non-bleed patients, respectively.
Science
"There is no confirmation on either a date or content in the photograph from the National Archives," said James P. Pritchett, the director of public and media communications at the National Archives.
News & Media
"There is no confirmation on either a date or content in the photograph," said James P. Pritchett, the director of public and media communications at the National Archives.
News & Media
You can sort this list on some RSS feeds by either date posted, or one of several ways, and this may be changed at any time.
Wiki
The commemoration of Traherne is held on either 27 September (the date of his death) or 10 October (the date of his burial).
Wiki
Type or write the date on either the left or right side of the paper.
Wiki
To the right of the "sort by" field, click on either the "Track," "Artist," or "Date Added" links.
Wiki
Furthermore, on two different sampling dates (samples taken on 5 December 2011 and 21 February 2012 and indicated by brackets in Table 1), an S. Newport isolate was recovered from each of the five samples on either sampling date, and the isolates on the same sampling dates shared a common S. Newport genotype lineage (II or III, respectively) (Table 1; Fig. 3).
Attempts were made to identify all trials meeting the inclusion criteria in the present review with no restrictions based on either publication date or language.
Science
Expert writing Tips
Best practice
When using "on either date", ensure the context clearly specifies which two dates are being referenced to avoid ambiguity. For example, "The report is due on either August 1st or August 15th".
Common error
Avoid using "on either date" when more than two dates are relevant; use "on any of the dates" or specify the relevant dates individually to avoid confusion.
Source & Trust
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "on either date" functions as a prepositional phrase modifying a verb or noun, indicating a temporal specification. It restricts the action or state to one of two possible dates. Ludwig confirms its usability.
Frequent in
Science
30%
News & Media
30%
Wiki
15%
Less common in
Formal & Business
10%
Encyclopedias
5%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "on either date" is a grammatically sound and frequently used prepositional phrase that offers a choice between two specified dates. Ludwig indicates its usability and confirms its widespread acceptance across various domains. While its meaning is clear, it's crucial to ensure context specifies the two dates in question to avoid ambiguity. Alternatives such as "on both dates" can be used when the action applies to both dates. It's important not to confuse this phrase with phrases like "by either date" which indicate a deadline rather than a specific date.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
on both dates
Specifies that the action or condition applies to both dates, not just one or the other.
on either of those dates
Emphasizes the selection between the two mentioned dates.
on each of the two dates
Highlights that the action occurs separately on both dates.
on any of the dates
Implies a possible choice among more than two dates, even if only two are relevant.
on the former or latter date
Formally distinguishes between two previously mentioned dates.
on the specified dates
Highlights that the dates were previously indicated or agreed upon.
on the aforementioned dates
Refers back to dates already mentioned in the discussion.
on the respective dates
Indicates that different actions or conditions apply to each date.
on either occasion
Substitutes "date" with "occasion", broadening the context slightly.
on both occasions
Similar to "on both dates", emphasizing that both occasions are relevant.
FAQs
How can I use "on either date" in a sentence?
Use "on either date" to indicate that an event or condition applies to one of two specific dates. For example, "You can submit your application "on either date", July 1st or July 15th".
What is a synonym for "on either date"?
A synonym for "on either date" is "on both dates", which specifies that something happens on both dates. However, if only one of the two dates is acceptable, "on either of those dates" might be more appropriate.
Is it correct to say "on either dates"?
No, the correct phrase is "on either date". The word "date" should be singular because "either" refers to one of two options, not multiple dates collectively.
How does "on either date" differ from "by either date"?
"On either date" specifies a particular date something will occur, while "by either date" implies a deadline or latest possible date for something to occur. For example, "The payment must be made by July 1st, and the service will commence "on either date", July 15th or July 22nd".
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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
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested