on days

USAGE SUMMARY

"on days" is correct and usable in written English.
It is used to refer to specific days or a particular day. For example, "On days when I am feeling stressed, I like to take a walk to clear my head."

✓ Grammatically correct

Science

News & Media

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

59 human-written examples

On days 22 and 29, one blood sample was collected.

British Journal of Cancer

On days when I'm not listening,.

The New Yorker

On days off I go to train.

The New York Times

That is harder on days like these.

The New Yorker

On days like this, its easy.

The Guardian - Lifestyle

On days off, sleep.

The Guardian - Lifestyle

Except on days like these.

The Guardian

On days off she sleeps.

The New Yorker

Both happened on days of celebration.

The Guardian

Surveys were undertaken on days without rain.

Earth, Planets and Space

Migraine started typically on days 1 5 and bleeding on days 3 5.

The Journal of Headache and Pain

Expert writing Tips

Best practice

When using "on days" to refer to a recurring event, specify the frequency to avoid ambiguity. For example, "Medication should be taken on days 1, 3, and 5 of each week."

Common error

Avoid using "on days" when referring to a continuous period. For example, instead of "The project ran on days," use "The project ran for several days."

Linguistic Context

The phrase "on days" functions as a prepositional phrase, typically modifying a verb or noun. It specifies the timing or occurrence of an action or event, similar to the examples shown by Ludwig.

Expression frequency: Very common

Frequent in

Science

39%

News & Media

35%

Formal & Business

26%

Less common in

Reference

0%

Encyclopedias

0%

Wiki

0%

Ludwig's WRAP-UP

In summary, "on days" is a prepositional phrase used to specify when certain events occur. Ludwig AI confirms its grammatical correctness and common usage across scientific, news media, and formal business contexts. When writing, it's important to specify frequency to avoid ambiguity and ensure the phrase aligns with its intended temporal meaning. As Ludwig's examples demonstrate, the phrase is versatile for specifying schedules, routines, or experimental protocols.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

during the days

Replaces "on" with "during", emphasizing the period within the days.

throughout the days

Similar to "during the days", but suggests a more continuous action over the period.

on certain days

Adds specificity, implying not all days but particular ones.

on specific days

Similar to "on certain days" but emphasizes that days have been picked out.

during those days

Refers back to a set of days already spoken about.

in the course of days

Expresses change or progression over a number of days.

over the period of days

Highlights a longer, less defined period.

at times during the days

Focuses on particular times within several days.

some days

General alternative that can replace depending on context, not as specific.

certain dates

More specific, focusing on the calendar dates rather than the days themselves.

FAQs

How can I use "on days" in a sentence?

Use "on days" to refer to specific dates or periods. For instance, "The lab will conduct experiments on days 3, 7, and 10 of the cycle."

What's a good alternative to "on days" that implies a continuous period?

For continuous periods, consider using phrases like "during the days" or /s/throughout+the+days, which better capture the sustained nature of an activity or event.

Is it correct to use "in days" instead of "on days"?

While "in days" can refer to a future timeframe (e.g., "The package will arrive in three days"), "on days" is more appropriate for specifying particular dates when something occurs.

Can I use "on days" to talk about general habits or routines?

While technically correct, it's often more natural to use "on weekdays" or "on weekends" when discussing routines that happen on certain types of days. For specific dates, "on days" works well.