The phrase "was finished on" is correct and usable in written English.
It is usually used to describe the end of a process or task. For example, "The project was finished on April 7th."
In 1919, one wing was finished on the Flatbush Avenue side, but a decade later, Brooklyn's grand vision was still a stalled embarrassment, an empty shell surrounded by pools of water collecting in adjacent foundations.
It was finished on Dec. 9.
Everything was finished on Sept. 1.
Still, despite some setbacks, the project was finished on time.
In 2008 work was finished on the Studio of Exhaustion from Diligent Service.
According to Airbus officials, the facility was finished on time and within budget.
The canal was finished on Oct. 26, 1825, two years ahead of schedule.
His wife first saw the place when it was finished on Memorial Day weekend.
Prices had crashed in 2010, shortly before work was finished on the Burj Khalifa, the world's tallest building.
Since the work was finished on Dec. 5, she said, she has had five parties in the kitchen for friends.
