Question

Why there are only 28 days in February

Answer 1

There was a time when the year began in the month containing the beginning of Spring, namely March. This meant that February was the last month of the year, and it originally had 30 days. (This is also why September, October, November, and December have roots for 7, 8, 9 and 10, respectively, even though they don't fall in those positions now.) 

July and August were renamed for Caesars of Rome and at the time those months were only 30 days. To honor the greatness of the Caesars, those months were extended to 31 days each and the days were taken from the end of the year, which at the time was February. 

When Christendom spread further, the beginning of the Calendar was changed to coincide with the month epiphany, rather than the pagan tradition of the month of the vernal equinox. 
The months we have today came from the Romans; originally there were 10 months - which explains the September, October, November and December names - which come from the Latin for 7, 8, 9 and 10. The problems started when Julius Caesar became the dictator perpetuo (dictator for life). He wanted his own month (July) - all the months had to be shortened to create the new month. ..

Please mark it as brainiest answer ..........

Answer 2

The new months each had 28 days. But that didn't sit well with Numa because even numbers were considered bad luck at the time. So, he added a day on to January, giving the year an odd-numbered 355 days. No one knows why February was left with 28 and remained an unlucky month.