当需要求当季的一个数量时，这两个函数会用得上；

以下函数求得当季的第一天与最后一天：

Function FirstDayInQuarter(Optional dtmDate As Date = 0) As Date
    If dtmDate = 0 Then
        dtmDate = Date
    End If
    FirstDayInQuarter = DateSerial(Year(dtmDate), Int((Month(dtmDate) - 1) / 3) * 3 + 1, 1)
End Function
Function LastDayInQuarter(Optional dtmDate As Date = 0) As Date
    If dtmDate = 0 Then
        dtmDate = Date
    End If
    LastDayInQuarter = DateSerial(Year(dtmDate), Int((Month(dtmDate) - 1) / 3) * 3 + 4, 0)
End Function

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