past 12 months

USAGE SUMMARY

The phrase "past 12 months" is correct and usable in written English. You can use it when referring to the time period that extends from the current date back to 12 months ago. For example, "Sales have increased significantly in the past 12 months." Alternative expressions include "last 12 months" and "previous 12 months."

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

48 human-written examples

MDE was dichotomized as "occurred in the past 12 months" vs. "did not occur in the past 12 months".

Health and Quality of Life Outcomes

The past 12 months have been challenging.

The Guardian

The past 12 months it shows that nobody's immune".

The New York Times - Sports

And this hasn't changed over the past 12 months.

The Guardian

Redundancies in the past 12 months total 430.

The Guardian

My salary hasn't changed in the past 12 months.

The Guardian

Human-verified similar examples from authoritative sources

Similar Expressions

12 human-written examples

Over the past 12-months FedEx's shares have lost 25.2%.

Forbes

Bank's shares down 57% in past 12 months.

Forbes

85% of readers have had sex in past 12 months.

Vice

They have risen 22.6 percent over the past 12 months.

The New York Times

Inflation has nearly doubled over the past 12 months.

The Economist

Expert writing Tips

Best practice

Use "past 12 months" when you want to describe a rolling window of time that concludes at the present moment. This is often more precise than "last year", which readers may interpret as the previous calendar year (e.g., January to December).

Common error

Avoid omitting the definite article when the phrase functions as a noun phrase in a sentence. While you might see "past 12 months have been hard" in news headlines due to space constraints, standard prose requires "The past 12 months have been hard."

Linguistic Context

In the English language, "past 12 months" serves as a temporal noun phrase that typically functions as an adverbial of time or the object of a preposition (such as "in", "over" or "during"). As noted by Ludwig AI, the phrase is structurally sound and follows standard quantifier-noun patterns where "past" acts as a deictic adjective anchoring the period to the present.

Expression frequency: Common

Frequent in

News & Media

45%

Science

30%

Formal & Business

20%

Less common in

Social Media

3%

Wiki

1%

Reference

1%

Ludwig's WRAP-UP

The phrase "past 12 months" is a highly reliable and grammatically correct way to describe a rolling one-year period. Ludwig AI confirms its widespread use across diverse domains, particularly in financial journalism and scientific research, where precision regarding time is paramount. Because it specifically refers to the 365 days leading up to the present, it avoids the ambiguity sometimes associated with "last year". Whether you are documenting a "past 12 months" trend in a business report or a clinical study, this phrase remains a top-tier choice for clarity and professionalism.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

last 12 months

Highly interchangeable and the most common direct synonym used in both speech and writing

previous 12 months

Often preferred in academic or formal reporting to denote a period immediately preceding a specific point

most recent 12 months

Explicitly emphasizes that the data is the most up-to-date available

prior 12 months

Common in business contexts to compare a current period against the one directly before it

preceding 12 months

Provides a slightly more formal tone, frequently found in legal or regulatory documentation

past year

A more concise version that views the 12-month span as a single unit of time

trailing 12 months

A specific financial term (TTM) used to report data from the most recent four quarters

last 365 days

Emphasizes the daily accumulation and precision of the time period

past 52 weeks

Shifts the focus to weekly tracking, common in retail or music chart data

last year

Broader and sometimes ambiguous as it can refer to the previous calendar year rather than a rolling period

FAQs

How do I use "past 12 months" in a sentence?

You can use it to establish a timeframe for recent events, such as: "The company's stock has doubled in the "past 12 months"." It functions similarly to "last 12 months".

What is the difference between "past 12 months" and "last year"?

While "last year" often refers to the previous calendar year (e.g., if today is in 2026, last year is 2025), "past 12 months" always refers to a rolling window of 365 days ending now. If you need absolute precision, you might use "the preceding year".

Should I use "past" or "last" for the 12-month period?

Both are correct and largely interchangeable. "past 12 months" is frequently found in financial and news reporting, while "last 12 months" is slightly more common in everyday conversation.

Can I say "over the past 12 months"?

Yes, using the preposition "over" is very common when describing a trend or change that happened throughout that period. A more formal alternative for business reports would be "during the previous 12 months".