The last day of school in Prince George’s County, Md., will be June 13, two days later than planned. (Photo by J. Lawler Duggan/For The Washington Post) (J. Lawler Duggan/For The Washington Post)

Prince George’s County has rescheduled the last day of classes to June 13, extending the school year by two days to compensate for time when schools were closed in March.

The Maryland school system also announced that it plans to dismiss students two hours early on June 9, June 12 and June 13, to give teachers time for year-end tasks.

County school officials said they made the decision after learning they had been unsuccessful in their efforts to obtain a state waiver of the requirement for a 180-day school year.

Schools in Prince George’s were closed for snow on March 14. Classes were also cancelled on March 8 after officials said about 1,700 teachers asked for the day off, as well as 30 percent of transportation staff. Many took leave to be part of a national demonstration called “A Day Without a Woman,” showing the importance of women in the workforce by staying home.