VBScript の関数、DateDiff
MsgBox DateDiff("d", "31-Jan-95", "30-Jan-95") MsgBox DateDiff("yyyy", "31-Jan-95", "30-Jan-95") MsgBox DateDiff("yyyy", "31-Jan-95", "31-Jan-96") 'MsgBox DateDiff("yyyy", "31-Feb-95", "31-Feb-96") MsgBox DateDiff("yyyy", "31-Dec-95", "1-Jan-96")