.NET按城市或经度和纬度获取时区

.NET get timezone by city or by longitude and latitude

本问题已经有最佳答案，请猛点这里访问。

我正在使用.NET，我能够通过IP地理定位用户城市。

有没有简单的方法来获取用户时区。和拉特。或城市名称？

我想知道facebook是怎么做的？

谢谢

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我确信这段代码可以简化，但这对我来说可以获得TimeZone ID和Name。

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Private Sub checkTZ()
Dim wc As WebClient = New WebClient()
Dim str As String = Nothing
Dim latPattern As String ="\bLatitude.*\<{1}"
Dim latRegSearch As Regex = New Regex(latPattern)
Dim lat As String = Nothing
Dim lonPattern As String ="\bLongitude.*\<{1}"
Dim lonRegSearch As Regex = New Regex(lonPattern)
Dim lon As String = Nothing

Try
str = wc.DownloadString("http://www.ipinfodb.com/my_ip_location.php")
lat = latRegSearch.Match(str).Value
lon = lonRegSearch.Match(str).Value
Catch ex As Exception
str ="Not Found"
End Try

Dim pattern As String ="\<|\s|\:|\bLatitude|\bLongitude"
Dim rgx As New Regex(pattern)
lat = rgx.Replace(lat,"")
lon = rgx.Replace(lon,"")

Dim firefoxEpochDate As Date ="1/1/1970"
Dim s_CurrentGoogleAPI As Long = DateDiff(DateInterval.Second, firefoxEpochDate, DateTime.UtcNow)
Dim xmldoc As XmlDocument = New XmlDocument()
Dim results2 As String = wc.DownloadString("https://maps.googleapis.com/maps/api/timezone/xml?location=" & lat &"," & lon &"&timestamp=" & s_CurrentGoogleAPI)
xmldoc.LoadXml(results2)
Dim tz_offset_hours As Double = (Convert.ToDouble(xmldoc.DocumentElement.Item("raw_offset").InnerText) + Convert.ToDouble(xmldoc.DocumentElement.Item("dst_offset").InnerText)) / 3600
End Sub

您可以使用网络服务按城市或经度和纬度获取时区：

http://www.earthtools.org/webservices.htm#timezone