获取一年中的第一天和最后一天

Get First And Last Day Of Year

在 VBA 中,我知道您可以使用此语法从日期中减去年份

Dim testdate As String, DateTest As String
testdate= "03/21/2017"
DateTest = Month(testdate) & "/" & Day(testdate) & "/" & Year(testdate) - 1

但是您如何找到给定年份的第一个和最后一个日期?例如,让我们使用相同的日期

testdate = "03/21/2017"

并得到以下值

firstdate = "01/01/2017"
lastdate = "12/31/2017"

如果您总是对年初和年末感兴趣,可以只使用 1 月 1 日和 12 月 31 日。模仿您的语法:

Dim testdate As String, DateTest As String
testdate= "03/21/2017"
FirstDayOfYear = "1/1/" & Year(testdate)
LastDayOfYear = "12/31/" & Year(testdate) 

您可以使用 DateSerial:

Sub Test()

    Dim dt As Date, firstDay As Date, lastDay As Date

    dt = Date
    firstDay = DateSerial(Year(dt), 1, 1)
    lastDay = DateSerial(Year(dt), 12, 31)

    Debug.Print firstDay
    Debug.Print lastDay

End Sub