June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian calendar. There are 193 days remaining until the end of the year.
On non-leap years (until 2039), this day marks the summer solstice in the northern hemisphere and the winter solstice in the southern hemisphere, and is the day of the year with the most hours of daylight in the northern hemisphere and the least hours of daylight in the southern hemisphere.
Read more about June 21: Events, Births, Deaths, Holidays and Observances