It is basically a calendar where employees fill in their names on the dates where they would like to have holidays.
2012年4月4日
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It would be a list of names(usually employees) and the dates they are going to be away on holiday. But it could also be a list of available dates for holidays that employees could choose from.
2012年4月4日
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It could also mean a list of people who are employed by a company to take the place of those on holidays.