In the sentence 'Memorial Day is in May,' which is correct?

MEMORIAL DAY is a federal holiday on the USCIS HOLIDAYS VOCABULARY list. It is observed on the LAST MONDAY IN MAY. The holiday honors U.S. military personnel who died in service to the country. Sample reading test sentences: 'Memorial Day is in May.' 'We honor soldiers on Memorial Day.' 'Memorial Day is in the spring.' The holiday originated after the Civil War as 'Decoration Day' — when Americans decorated the graves of soldiers who died in that war. Over time, it expanded to honor all Americans who died in any war. In 1971, the Uniform Monday Holiday Act made it a federal holiday on the last Monday in May. Common observances: ceremonies at military cemeteries; placing flags on veterans' graves; the National Memorial Day Parade in Washington, D.C.; moments of silence; family barbecues marking the unofficial start of summer. Memorial Day is DIFFERENT from VETERANS DAY (November 11), which honors ALL who have served (living and dead). It's also different from Armed Forces Day (May, honoring those currently serving). MAJOR FEDERAL HOLIDAYS in the U.S. are typically held on Mondays (creating long weekends) — Memorial Day, Labor Day, Columbus Day, Martin Luther King Jr. Day, Presidents Day.