The phrase "first day of operation" is correct and usable in written English.
You can use it when referring to the very first day that a business or organization begins work or operations. For example, "The staff of the company was very excited for the first day of operation."
As such, the business was unstable from almost the first day of operation.
Shelby's gained positive reviews and Mr. Salonia got the experience of building a reputation from the first day of operation.
The company's Web site with details about the recall had 1.26 million visitors on Tuesday, the first day of operation, according to ComScore Networks, a market research firm.
The £350,000 Liquid Box Office crashed on its first day of operation, causing sales to be suspended for a week.
But on April 17, the first day of operation, only one of every eight attempts resulted in a successful search of the database.
The site has already attracted considerable attention, logging 4,652 visits and 6,152 page views on Wednesday, its first day of operation, nearly as many as the old site recorded for the entire month of May.
Within the first day of operations, it became apparent that both potentially exposed and unexposed persons needed emotional support and further information about the event, the risk for anthrax exposure, and the dangers of antibiotic misuse.
It was the company's second day of operation since a panel of state appellate judges on Monday rebuffed city and state efforts to sideline the buses while regulators try to shut down the company.
I knew Caroline was keen to go skating on the special Christmas rinks at London's Somerset House or Kew Gardens; I knew no previous suitor had taken her to the Eiffel's rink because it only opened last week, and our date was for its second day of operation; and I knew a nice little hotel where - quel dommage - the only rooms left were doubles.
On the sixth day of operation, the average normalized permeability declined to 87±9%9% for intermittent operation with anti-scalant and with rinse.
