vb net获取系统时间

Sub gettime()

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nowtime = Format(DateTime.Now, "yyyy/MM/dd hh:mm:ss")

MsgBox nowtime

End Sub

其中DateTime.Now为当前系统的时间

Format是设置时间格式

效果如下

求助，VB.Net设置系统时间问题

pre class="html" name="code" /prepre class="html" name="code"Imports System.Runtime.InteropServices

StructLayout(LayoutKind.Sequential) _

Public Structure SYSTEMTIME

Public Year As Short

Public Month As Short

Public DayOfWeek As Short

Public Day As Short

Public Hour As Short

Public Minute As Short

Public Second As Short

Public Miliseconds As Short

End Structure

'api函数声明

DllImport("kernel32.dll", CharSet:=CharSet.Ansi) _

Public Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean

End Function

Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)

Dim ServerTime As Date = F.G("select getdate()")

ServerTime = ServerTime.AddHours(-8)

Dim t As New SYSTEMTIME()

t.Year = ServerTime.Year()

t.Month = ServerTime.Month()

t.Day = ServerTime.Day

t.Hour = ServerTime.Hour

'这个函数使用的是0时区的时间,对于我们用+8时区的,时间要自己算一下.如要设12点，则为12-8

t.Minute = ServerTime.Minute

t.Second = ServerTime.Second

t.Miliseconds = ServerTime.Millisecond

Dim v As Boolean = SetSystemTime(t)

MessageBox.Show(v)

End Sub/prebr

pre/pre

pre class="vb" name="code" /prepre class="vb" name="code" /prepre class="vb" name="code" /pre

Vb.net 2008 如何获取网络时间

你是指Internet上的国际标准时间吗。

先加入控件 AxWinsock1 在.Com中Microsoft.Winsock

Public Class Form1

Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Integer)

Dim NoSrv As Boolean

Dim TimeFromNet As String

Dim OldTime As Date

Dim NewTime As Date

Dim MyDate As Date

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()

AxWinsock1.Protocol = MSWinsockLib.ProtocolConstants.sckTCPProtocol

NetTime("") '首先取中科院国家授时中心时间

If NoSrv Or TimeFromNet = "" Then

NetTime("time.nist.gov") '取美国标准技时院时间

If NoSrv Or TimeFromNet = "" Then

MsgBox("检测不到网络标准时间服务器time.nist.gov！")

Else

NetTime("time.nist.gov")

If TimeFromNet = "" Then

MsgBox("网络标准时间服务器time.nist.gov超时！")

Else

MyDate = Mid(TimeFromNet, 8, 8)

OldTime = Mid(TimeFromNet, 17, 8)

NewTime = TimeSerial((Hour(OldTime) + 8) Mod 24, Minute(OldTime), Second(OldTime))

Dim MyTime As DateTime = MyDate Space(1) NewTime

MsgBox(MyTime)

'SetWindowsClock(MyTime)

End If

End If

Else

'使网络误差时间小，第2次再中科院国家授时中心时间

NetTime("")

If TimeFromNet = "" Then

MsgBox("网络标准时间服务器超时！")

Else

MyDate = Mid(TimeFromNet, 8, 8)

NewTime = Mid(TimeFromNet, 17, 8)

Dim MyTime As DateTime = MyDate Space(1) NewTime

MsgBox(MyTime)

'SetWindowsClock(MyTime)

End If

End If

End Sub

Private Sub NetTime(ByVal TimeSrv As String)

NoSrv = False

TimeFromNet = ""

If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()

AxWinsock1.RemoteHost = TimeSrv ' "" 或 "time.nist.gov"

AxWinsock1.RemotePort = 13

AxWinsock1.LocalPort = 0

AxWinsock1.Connect()

Do While TimeFromNet = ""

If NoSrv Then Exit Do

Sleep(55)

System.Windows.Forms.Application.DoEvents()

Loop

If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()

End Sub

Private Sub AxAxWinsock1_CloseEvent(ByVal sender As Object, ByVal e As System.EventArgs) Handles AxWinsock1.CloseEvent

AxWinsock1.Close()

End Sub

Private Sub AxAxWinsock1_DataArrival(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent) Handles AxWinsock1.DataArrival

AxWinsock1.GetData(TimeFromNet)

End Sub

Private Sub AxAxWinsock1_Error(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_ErrorEvent) Handles AxWinsock1.Error

NoSrv = True

End Sub

End Class

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