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对于大多数这些函数,您可以将date参数指定为DateTime对象,例如DATE(2003,7,4)之类的函数的结果,或TimeSpan对象,例如TIME( 12,0,0)。 为了与Excel兼容,它还允许将日期指定为数字(如37806.5)或字符串(如“ 7/4/2003 12:00”)。 数字和字符串将转换为DateTime类的实例。
日期作为数字值以x.y格式表示,其中x是“自1899年12月30日以来的天数”,y是天数的一部分。 左边的数字代表日期。 时间作为数字值是十进制小数,范围从0到0.99999999,代表从0:00:00(上午12:00:00)到23:59:59(下午11:59:59)的时间。
以下三个公式产生相同的结果:
YEAR(DATE(2004,8,9))
YEAR(38208)
YEAR("8/9/2004")
在Excel中,日期的范围可以从01/01/1900到12/31/9999,在.NET框架中,DateTime类的实例的范围可以从01/01/0001到12/31/9999。 在SpreadJS中,我们通常支持.NET框架中更大的范围。 为了与Excel兼容,在某些情况下该函数仅允许较小的范围(例如,DATE函数只能用于输入自01/01/1900开始的日期)。
Excel和OLE自动化都使用双精度表示日期和时间,而双精度的整数部分表示距基准日期的天数。 在Excel中,使用的基准日期是01/01/1900,而1900年被视为a年。 在OLE自动化中,Microsoft通过使用12/31/1899的基准日期来更正此问题。 像OLE自动化一样,我们的表单将1900年视为非non年,因此使用12/31/1899作为基准日期。