The phrase "about one month before" is correct and usable in written English.
It can be used to indicate a time frame that is approximately one month prior to a specific event or date.
Example: "The project was completed about one month before the deadline."
Alternatives: "approximately one month prior" or "roughly one month earlier".
These self-guided tours — which are allotted on a first-come-first-served basis about one month before the requested date — allow you to explore the public rooms and the gardens.
The Dragon capsule will attempt to connect with the ISS on June 4, and it'll remain attached for about one month before it returns to earth with a planned splashdown in the Pacific Ocean.
It's about one month before the Cambridgeshire.
The video was made about one month before the school shootings and shows the gunmen, Eric Harris, above, and Dylan Klebold, with the weapons they used to kill 12 classmates, a teacher and themselves on April 20 , 1999
Ordinarily this would not have been a problem but our mortgage is up for renewal about one month before my wife has to decide whether to resign or return to work.
Lambert Lamba, a Cameroonian activist who works on behalf of sexual minorities, said Mbede had been out of the hospital for about one month before his death and had received no medical care during that time.
To this end, global ED risk, and knowledge about EDs as well as values of different ED risk factors are measured one month before, immediately following, as well as six months after the intervention in both conditions of the trial.
She tried re-registering, but with about one month left before a November election that will decide a governor's race and some competitive U.S. House races, Appling-Nunez's application is one of over 53,000 sitting on hold with Georgia Secretary of State Brian Kemp's office.
