at the same day

USAGE SUMMARY

The phrase "at the same day" is not correct in standard written English.
The correct expression is "on the same day," which is used to refer to events occurring within the same calendar day. Example: "We will have our meeting on the same day as the conference."

⚠ May contain grammatical issues

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Then, they transplanted these primed hNSCs into the contusion lesion of rats at the same day or 3 or 9 days postinjury.

BioMed Research International

The extract was administered continuously for 14 more days after conducted the surgery at the same day with same dose.

BMC Complementary and Alternative Medicine

the higher the SOFA score, the higher the CD64 index measured at the same day.

Intensive Care Medicine Experimental

99mTc-MIBI scan was performed the day before operation in two patients and at the same day in one patient.

EJNMMI Research

Evaluation should be made by comparing the health degree to its corresponding historical value (e.g. the value at the same day in the last week).

European Transport Research Review

They get arrested at the same day that Roosari Sefid-ha were protesting outside Azadi stadium.

HuffPost

At the same day, at the night, the Saudi-led coalition struck Sana'a in retaliation.

HuffPost

Biochemical analyses were performed at the same day.

BMC Gastroenterology

Questionnaire and 6MWT took place at the same day.

BMC Pulmonary Medicine

CI detected the first positive lab result at the same day and counts the 3 cases.

Antimicrobial Resistance and Infection Control

Immediately after treatment, two patients experienced coldness related discomfort which resolved at the same day.

BioMed Research International

Expert writing Tips

Best practice

Always use "on the same day" instead of "at the same day" for grammatically correct writing.

Common error

Avoid using "at" when referring to specific days. "At" is generally used for points in time, while "on" is used for days and dates. For example, say "on Monday" instead of "at Monday".

Linguistic Context

The phrase "at the same day" functions as an adverbial phrase intended to specify when an action or event occurs. However, it's grammatically incorrect, as noted by Ludwig.

Expression frequency: Very common

Frequent in

Science

74%

News & Media

12%

Formal & Business

14%

Less common in

Science

0%

News & Media

0%

Formal & Business

0%

Ludwig's WRAP-UP

The phrase "at the same day" is a commonly used expression that, according to Ludwig, is grammatically incorrect. The correct form is "on the same day". While frequently found in diverse contexts, including science and news, it's essential to use the grammatically correct version in formal writing. Remember that, while the intent is to convey simultaneity, using "on" ensures accuracy. Ludwig examples show the phrase's presence across various sources, underscoring the importance of adhering to proper grammar for clarity and credibility.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

on the same day

Uses the correct preposition "on" instead of "at" to indicate the time frame.

that same day

Replaces "the same" with "that same" for emphasis.

the very same day

Adds "very" for stronger emphasis on the simultaneity.

concurrently

Emphasizes the simultaneous occurrence of events, but is more formal.

simultaneously

Indicates that events happen at the exact same time.

in parallel

Suggests events happening alongside each other, emphasizing the side-by-side aspect.

at the same time

Broader term indicating simultaneity, not specific to a day.

on that occasion

Refers back to a specific event or day already mentioned.

during the same timeframe

Refers to the events happening within the identical temporal range.

within the same 24 hours

Emphasizes the time constraints of one day.

FAQs

What's the correct way to say "at the same day"?

The correct way to express this idea is to use the phrase "on the same day". The preposition "on" is used with specific days and dates.

Can I use "at the same day" in formal writing?

No, "at the same day" is grammatically incorrect. In formal writing, always use "on the same day" to maintain clarity and credibility.

What are some alternative ways to say "at the same day" that are more concise?

You can use phrases like "that same day" or, depending on the context, simply "simultaneously" if you're referring to actions occurring at the exact same time.

Is there a difference in meaning between "at the same day" and "on the same day"?

"At the same day" is not grammatically correct. The correct phrase is "on the same day". This refers to events happening within the same 24-hour period.