The phrase "until the moment before" is correct and usable in written English.
You can use this phrase to describe a time frame, or to emphasize that something was completed right before something else. For example: "I had been working on the project for weeks until the moment before it was due."
It's cold and drizzling with the actors under umbrellas until the moment before "Action!", when the puddles are briskly swept from the path before the actors stroll down.
A plan by Thailand's prison service to broadcast the lives of death-row inmates on its Web site right up until the moment before execution has been scrapped, the local media reported.
I learned to stay inside until the moment before my bus came, and then dash past anyone who was waiting in the parking lot, waving and yelling, "Come see me on Thursday!" And I missed her terribly.
One's sense of self develops over a lifetime, so you can't actually have it all figured out until the moment before you die.
Many compared the demise of the group to that of fellow pop band Steps, as they too had denied their intentions until the moment before their split, after which they were accused of acting out of "greed and cynicism".
His new design, with its four-way-stretch Spandex material, also leaves no marks, so it can be worn right up until the moment before a big meeting or interview, Henry says.
In fact, he reports that he remembers quite a bit up until the moments before he needed to slow the train down.
Until the last moment before the announcement, the military leaders, top diplomats and senior judicial officials all professed that they could not interfere until the investigation had run its course.
Up until the last moment before the jury disappeared to begin deliberations on Tuesday, lawyers for Ms. Sheehan argued that evidence going back years — of blackened eyes, a split forehead and a bruised body — should not be eclipsed by the scenes from a life of material privilege.
I'm determined to drive, read, laugh, drink wine, travel, listen, learn, and love right up until the last moment before the curtain closes on this body of mine.
Cytoplasmic LC3 is commonly used as a marker of autophagosomes because it is the essential part of the vesicle and remains associated until the last moment before its fusion.
