By 9:35 the morning of May 7, thousands watched bulletins posted on the side of the Times Tower, thousands more were glued to the radio.

By 10:30, the bells of Trinity Church pealed over the Financial District.

By 11:30, 25,000 had jammed the Times Square subway station.

The Telephone Company recorded its busiest day in history.

By noon, the Broadway area was closed to traffic. (Now, of course, we wouldn’t have to worry. We have only fat, bloated out-of town bellies lying there.)

By afternoon, bars had run out of beer.

At 8 p.m., the Lady in the Harbor’s torch was lit.

What a different time. Americans came together — no matter their race or religion.

As Hitler rose to power in Germany and American Nazi supporters marched in Yorkville, recently arrived Jewish immigrants were finding refuge just across town — on the Upper West Side.

Lorraine Diehl has just written “Over Here! New York City during WWII.” The publisher is HarperCollins.

She writes there was no housing to be had. The Levitt family owned 4,000 acres of potato fields around the town of Hempstead. Lt. William Lovett convinced his father to subdivide and build mass-produced houses that could sell cheaply to returning servicemen.

Levittown, the country’s first instant suburb, was announced May 7, 1947. Two thousand rental homes — at $67 a month.

NYC’s housing commissioner was trying to find a home for Mayor La Guardia, who was leaving Gracie Mansion. No success. He said if the mayor couldn’t find a home, what about the thousands of servicemen disembarking from those troopships?

That was the beginning of 18 city blocks of families, their churches, schools and shops being leveled for Stuyvesant Town, Manhattan’s first planned middle-class community.

NYC was Point A in stopping the war. The Woolworth Building’s 11th, 12th and 14th floors, in the shadow of City Hall, was the front for assembling The Bomb.

Its real work was done in an unassuming building on the southwest corner of Chambers Street overlooking City Hall Park. That’s what they called Ground Zero.

Then came Rockefeller Center’s Victory Gardens. Then came a tradition started when fir trees were planted along Park Avenue’s dividing line and lit to honor the war dead. Ever since its residents get tapped annually for money. Since New York raises funds for everything, most of us figured it’s just another hustle. I don’t remember if we gave. I only remember every year we were dunned. Until this book, we didn’t know why. Now we know.

Friday is May 7.

WHITNEY Harris, maybe the last of the Nuremberg Jury prosecutors who brought Nazi war criminals to justice, just left us. He was 97