Harvard is advising international students and scholars to be in the US by September 15, when new visa rules take effect. Those entering or re-entering later could face four-year limits, shorter grace periods and new requirements for extensions, transfers and course changes.

Harvard warns international students of significant changes to visa regulations effective September 15.

Harvard is advising international students and scholars to be in the US by September 15, when new visa rules take effect. Those entering or re-entering later could face four-year…