The Detroit school board approved this year’s academic calendar Tuesday night, hours after Detroit’s main district and its largest teachers union settled a contract disagreement.

The calendar approval, which comes just three weeks before the first day of school, includes some changes to the original calendar spelled out in the teachers’ contract.  The new calendar was approved last week by a school board subcommittee without comment from the the Detroit Federation of Teachers, and it was on the agenda for tonight’s meeting of the full school board.

After discussion with the district, the union signed an agreement on the changes, known as a memorandum of understanding.

The calendar eliminates one-hour-early releases on Wednesdays and moves the teacher training that occurred during that time mostly to the beginning of the school year. It also will move spring break to April 1-5, 2019 — a few weeks earlier than the April 19-26 break specified in the contract.

Superintendent Nikolai Vitti said the situation was not ideal, and he realizes that some teachers may already have made plans for the week of April 19-26.

“Hopefully, our teachers realize they should be there,” he said. But if vacation plans were already made and can be changed, “that’s good.”

“We will be prepared as much as possible to have substitutes and even district staff, if it’s necessary,” he said.

Ivy Bailey, president of the Detroit Federation of Teachers, said teachers aren’t pleased about the agreement.

“No, we were not happy with the change,” Bailey said.

Addressing a question from board member LaMar Lemmons, Bailey said the calendar changes “did constitute an unfair labor practice” because, among other reasons, teachers lost preparation days with the new calendar.

“We are not happy, but we are here for students,” Bailey said. “We understand this is what’s right for students. We put students first, and we are going to work it out.”

The earlier spring break is designed to avoid the testing window for the Preliminary Scholastic Aptitude Test, a college entrance exam commonly known as the PSAT.

Other changes to the calendar include eliminating scheduled parent-teacher conferences on October 31 because of the Halloween celebration.