May 30 is a date in the Gregorian calendar that normally falls as the 150th day of the year and the 151st in a leap year, leaving 215 days remaining in common years. Its position late in May means it frequently coincides with spring observances in the Northern Hemisphere and autumn in the Southern Hemisphere.

Overview and calendar notes

The date is part of the modern Gregorian system introduced in the 16th century; for general background see the Gregorian calendar. Because the United States and several other countries historically marked remembrance ceremonies in late May, May 30 acquired special public recognition in some traditions.

Observances and commemorations

Historically, May 30 was associated with Decoration Day in the United States, a 19th‑century tradition of honoring those who died in military service; over time that observance evolved into what is now Memorial Day, a federal holiday observed on the last Monday in May. Internationally, May 30 is also observed as World Multiple Sclerosis Day, a health awareness day organized to highlight challenges faced by people with MS.

Notable events

  • 1431: Joan of Arc was executed in Rouen; her trial and death remain widely noted in European history.
  • Late 19th century: Decoration Day ceremonies became common across the United States, often held on May 30.
  • 1911: The inaugural Indianapolis 500 automobile race was held at the Indianapolis Motor Speedway, an event that became an enduring motorsport tradition.

These entries are representative rather than exhaustive: many other local, national and cultural events have occurred on May 30 across different eras and regions.

Context and distinctions

Because holidays and observances shift with legislation and custom, May 30's public significance varies by country and over time. In the U.S., for example, Memorial Day is no longer fixed to this date but to the last Monday in May. Other commemorations tied to May 30 remain annual or movable depending on regional calendars.

For readers seeking further detail on specific events, biographical anniversaries or localized holidays that fall on May 30, consult specialized chronologies or national holiday lists.