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Function NetTime(Optional url As String) As String '返回包括时间和日期的字符串
Dim obj, OBJStatus, Retrieval
Dim GetText As String
Dim i As Long
Dim myDate As Date
Set Retrieval = CreateObject("Microsoft.XMLHTTP")
If url = "" Then
url = "http://www.time.ac.cn/stime.asp" '从国家授时中心网页获取时间
End If
'通过下载网页头信息获取网络时间
On Error Goto ToExit
With Retrieval
.Open "Get", url, False, "", ""
.setRequestHeader "If-Modified-Since", "0"
.setRequestHeader "Cache-Control", "no-cache"
.setRequestHeader "Connection", "close"
.Send
If .Readystate <> 4 Then Exit Function
GetText = .getAllResponseHeaders()
i = InStr(1, GetText, "date:", vbTextCompare)
If i > 0 Then '网页下载成功
i = InStr(i, GetText, ",", vbTextCompare)
GetText = Trim(Mid(GetText, i + 1))
i = InStr(1, GetText, " GMT", vbTextCompare)
GetText = Left(GetText, i - 1)
myDate = GetText '字符串变为时间类型
myDate = myDate + #8:00:00 AM# '将时间转化为北京时间
NetTime = myDate '将时间转化为字符串
End If
End With
ToExit:
Set Retrieval = Nothing
Set OBJStatus = Nothing
Set obj = Nothing
End Function