Metro

De Blasio is late, delays Correction grad ceremony

He was Mayor Tardy to this party.

The habitually late Mayor de Blasio showed up nearly an hour late to a Department of Correction graduation ceremony Friday — irking families and officers who attended.

More than 300 newbies who were set to be hailed at Brooklyn College were kept holed up in a small upstairs room, then left standing in line when the mayor’s belated arrival put the ceremony on hold, attendees told The Post.

The ceremony, scheduled for 10 a.m., didn’t start until about 11, they said.

“There were people that were very unhappy. I think a lot of people were disappointed,” said Joanne Della Valle, of Manorville, LI, whose son Jordan was among the graduates.

She noted de Blasio didn’t even stay for the whole event.

“It was bad enough that he was late and everybody’s waiting,” she said. “To leave early, it was, in my opinion, a little bit disrespectful.”

Some grads didn’t mind the mayor’s abbreviated stay, saying they were honored he made the effort.

“He is the mayor. He has a lot of things to do,” said a 27-year-old officer. “I’m sure there was a pressing matter that held him up.”

Others were less forgiving, with one female officer saying: “It was unprofessional. It’s ridiculous he came late, which held up the ceremony, and he left early. I was disappointed.”

De Blasio aides said the event was a late addition to the mayor’s schedule, penciled in only after a block of free time materialized at the last minute.

They said his speech was well received and that he had stayed to hear at least two other speakers before leaving.

De Blasio’s tardiness is part of a pattern.

During his campaign, he routinely arrived to his own events 20 to 40 minutes late.

He explained his particularly late arrival at one November stop by saying his sleep had been disrupted an early phone call.

“I am not a morning person,” he had said. “I think we should reorient our society to staying up late, but I don’t think that’s happening right now.”

Since becoming mayor, de Blasio’s punctuality hasn’t improved.

“Sometimes, things happen during the time that we had scheduled to start that are priorities that we have to deal with,” de Blasio explained when asked about his lateness.

He added he was “very comfortable” with the way the administration has been operating.

Joanne Della Valle’s husband, Nick, who was also at the ceremony, said keeping others waiting is simply “rude.”

“Everything was good — except for the mayor being late,” he said.