This day is the first day of the second third of the year, as well as the one third point of a common year because there are 121 days before and 243 days after it in common years. There are 122 days before and 243 after it in leap years. The exact time the second third of the year starts is 4:00 p.m. In countries that use summer time the actual exact time of the midpoint in a common year is at 5:00 p.m for locations in the northern hemisphere, or 3:00 p.m. for locations in the southern hemisphere; this is when 121 days and 16 hours have elapsed and there are 243 days and 8 hours remaining. In a leap year in those countries, the second third of the year starts at midnight. In countries that use summer time, the second third starts at 1:00 a.m. on May 2, or 11:00 p.m. on May 1 in the southern hemisphere. This is due to summer time having advanced the time by one hour. 