In Japan, fiscal year starts in April and ends in March. This month is quite busy season in Japan preparing for new life.
A year in old Japan used to start in September following the U.S system. However, it changed from September to April.
There are two reasons. First of all, the Japan army changed the opening day of notification which is to join the army from September to April. Secondary, financial year also changed like the above. Consequently, schools which are given subsidy from a prefecture and country had to change the entrance month to April. (students in Japan have entrance ceremony in April and graduation ceremony in March.)
I bet fiscal year is very different in the world. When years start in your country?