How to pronounce “march 21” in English

"Water for Elephants" opened on March 21 at the Imperial Theater on Broadway to rave reviews.

And this document is dated March 21, but because the Sabbath was the next day, she, in fact, couldn't be arrested until Monday, which left her time on Sunday to go to church

And then, a week later-- March 21-- finally, the Selma to Montgomery march began.