As part of Princeton University’s response to the recent uptick in COVID-19 cases in New Jersey, students returning to campus from winter break will not be allowed to travel outside of the county unless they have “extraordinary” reasons. The earliest return date for the Ivy League school’s undergraduate students, who are currently on a recess, will be pushed back by one week to Jan. 14, according to a message sent to students by the administrators. “Because the pandemic continues and the highly transmissible Omicron variant presents yet another challenge to public health, the University has decided to organize a gradual return for undergraduate students,” Jill Dolan, the dean of the college, and W. Rochelle Calhoun, vice president for campus life, wrote in the message. The undergraduates’ return for the 2022 spring semester will be staggered between Jan. 14 and 23 to help “flatten the curve of the campus positivity rate,” …