Why has February 28 days
February is the second month of the year in the Gregorian calendar, but it was the last time. It is the shortest Gregorian month, which has only 28 or 29 days. February has 29 days in bisect years, and in other years he has 28 days.
Those who are "to blame" for the situation are the Romans. February was a "neglected" month in history. In the end it usually has 28 days because the Romans used the monthly cycles to divide the month into months. There was also superstition and politics.
The moons were calculated from the first occurrence of the moon in the sky and were divided into three parts: the calendars (the new moon), nonele (the first square), and the moon (full moon). At first, the calendar had 355 days. The New Year fell on March 1, so February was the last month of the year. As the Earth revolves around the Sun in 365 days, to recover the delay, every two years a month of 22 or 23 days intersects in February, according to the Lumina newspaper
Dictator Julius Caesar, advised by an astronomer from Alexandria, changed the timetable: he decreed the year of 365 days. It was also decided that every four years one year would have 366 days to recover the six extra hours each year. Still, the New Year moved from March 1 to January 1. The months were thus made up of 30 and 31 days alternately, and February remained for 28 days, so the extra day of the bisect year was counted in February. This was, in 45 BC, Hr., The Julian reform of the calendar.
In the clip below, the After Skool Channel on YouTube explains (English) how it came to February to have so few days: