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Обработка даты
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add12Hours is a function.
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add12Hours(dateString) should return a string.
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add12Hours("January 17 2017 11:43am EST") should return "January 17 2017 11:43pm EST"
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Should handel day change. add12Hours("March 7 2009 7:30pm EST") should return "March 8 2009 7:30am EST"
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Should handel month change in a leap years. add12Hours("February 29 2004 9:15pm EST") should return "March 1 2004 9:15am EST"
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Should handel month change in a common years. add12Hours("February 28 1999 3:15pm EST") should return "March 1 1999 3:15am EST"
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Should handel year change. add12Hours("December 31 2020 1:45pm EST") should return "January 1 2021 1:45am EST"
/**
* Your test output will go here.
*/