First day of school
The first day of school is the first day of an academic year. This is usually in August or September in the Northern Hemisphere and January or February in the Southern Hemisphere, but differs from country to country.
The first day of school in Costa Rica is in early February. The Education Ministry changes the date every year to ensure 200 effective days are in the school calendar.
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In the United States, educational policy is determined primarily at the state level and at the level of individual school districts. Therefore, there is no one particular day on which all schools start. During much of the 20th century, it was common for schools to start shortly after Labor Day, and in some areas of the United States, this is still the norm. However, it has become increasingly common for schools to start earlier in August or even late July. For example, in San Diego Unified School District, San Diego, California, the first day of school for the 2017-18 school year was set to August 28.
The government school calendar in the Philippines usually begins in June every year. However, private schools have the exception to deviate from the calendar as regulated by Republic Act No. 7797. Some colleges or universities may start the school year on August. The school year must consist of 200 but not more than 220 days.
The school year for all Singapore primary and secondary schools will start from early January and end sometime in November. This takes into account 40 weeks of curriculum time for teaching and learning before the start of the national examinations, and six weeks of school vacation at end of year for teachers and students.
According to a 2010 decree of Polish Minister of Public Education, the first day of school for regular compulsory education schools in Poland is on September 1 or the first following Monday if September 1 falls on Friday, Saturday or Sunday. The last day is the last Friday after 18th of June.  Previously, according to a similar 2002 decree, the above exception was only for Saturday and Sunday, and the last day was the first Friday after June 18.
Schools in Russia (and formerly Soviet Union) historically begin on September 1. This exact date for the country has been fixed by the Decree of the Council of the People's Commissars in 1935 and was established officially by the Decree of the Supreme Soviet of the Soviet Union No. 3018-X in 1980. In 1984, September 1 was officially declared to be the Knowledge Day. If it falls on Sunday, most schools opt to hold on Sunday a traditional ceremonial line-up, which symbolically commences the school year, and begin actual lessons on Monday. Traditionally students bring flowers to the teachers.
England and Wales
The first day of school for state schools in England and Wales varies by local authority and sometimes by school, but it is nearly always during the first week of September, or occasionally in the second week.
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