将UTC时间转换为当地时间 [英] Convert UTC time to local

问题描述

我有一个用于两个不同时区的MS Access应用程序.区别是7个小时.我需要找到两个办公室都关闭的时间，这样我才能关闭它们的数据库，并进行压缩和修复以及备份它们.

I have an MS Access app which is used in two different time zones. The difference is 7 hours. I needed to find a time when the both of the offices are off so I can close their database and I can do compact and repair and do backup of them.

因此，我不需要创建两个单独的前端，我告诉关闭数据库一个在1000 PM，另一个在下午4点告诉我，我可以说可以说在世界标准时间上午0:30关闭数据库. 但是我不知道如何在本地转换相同的. 现在，我用于关闭数据库的代码如下:

So I will not need to create two separates front end and I tell close database one at 1000 PM and another in 4 AM I figure out I can say Close database at 00:30 AM UTC. But I do not know how to convert the same one in Local. Right now my code for closing the database looks like this:

Private Sub Form_Timer()
Dim RunAtLocalTime As String

RunAtLocalTime = Format(Now(), "HH:MM:SS")
If RunAtLocalTime = ("00:00:00") Then
        DoCmd.Quit
End If
End Sub

我想做这样的事情:

Private Sub Form_Timer()
Dim RunAtLocalTime As String
Dim UTCTIME As 

'''RunAtLocalTime = Convert(UTCTIME)
 RunAtLocalTime = Format(Now(), "HH:MM:SS")
 If RunAtLocalTime = ("00:00:00") Then
        DoCmd.Quit
End If
End Sub

推荐答案

我发现了以下功能:

这将返回UTC时区偏移量:

This one returns the UTC timezone offset:

Option Compare Database
Option Explicit

Private Declare Function GetTimeZoneInformation Lib "kernel32" (lpTimeZoneInformation As TimeZoneInfo) As Long


Private Type SystemTime
        intYear As Integer
        intMonth As Integer
        intwDayOfWeek As Integer
        intDay As Integer
        intHour As Integer
        intMinute As Integer
        intSecond As Integer
        intMilliseconds As Integer
End Type


Private Type TimeZoneInfo
        lngBias As Long
        intStandardName(32) As Integer
        intStandardDate As SystemTime
        intStandardBias As Long
        intDaylightName(32) As Integer
        intDaylightDate As SystemTime
        intDaylightBias As Long
End Type

Public Function GetUTCOffset() As Date
    Dim lngRet As Long
    Dim udtTZI As TimeZoneInfo

    lngRet = GetTimeZoneInformation(udtTZI)
    GetUTCOffset = udtTZI.lngBias / 60 / 24
End Function

来源:[此网站](编辑链接不再有效，已删除)

source: [this site] (edit link no longer valid, removed)

这将时间转换为格林尼治标准时间的时间:

And this one that converts a time to GMT:

Option Explicit
Private Type SYSTEMTIME
    wYear As Integer
    wMonth As Integer
    wDayOfWeek As Integer
    wDay As Integer
    wHour As Integer
    wMinute As Integer
    wSecond As Integer
    wMilliseconds As Integer
End Type
Private Type TIME_ZONE_INFORMATION
    Bias As Long
    StandardName(31) As Integer
    StandardDate As SYSTEMTIME
    StandardBias As Long
    DaylightName(31) As Integer
    DaylightDate As SYSTEMTIME
    DaylightBias As Long
End Type

Private Declare Function GetTimeZoneInformation Lib "kernel32" (lpTimeZoneInformation As TIME_ZONE_INFORMATION) As Long
'Purpose     :  Converts local time to GMT.
'Inputs      :  dtLocalDate                 The local data time to return as GMT.
'Outputs     :  Returns the local time in GMT.
'Author      :  Andrew Baker
'Date        :  13/11/2002 10:16
'Notes       :
'Revisions   :

Public Function ConvertLocalToGMT(dtLocalDate As Date) As Date
    Dim lSecsDiff As Long

    'Get the GMT time diff
    lSecsDiff = GetLocalToGMTDifference()
    'Return the time in GMT
    ConvertLocalToGMT = DateAdd("s", -lSecsDiff, dtLocalDate)
End Function

'Purpose     :  Converts GMT time to local time.
'Inputs      :  dtLocalDate                 The GMT data time to return as local time.
'Outputs     :  Returns GMT as local time.
'Author      :  Andrew Baker
'Date        :  13/11/2002 10:16
'Notes       :
'Revisions   :

Public Function ConvertGMTToLocal(gmtTime As Date) As Date
    Dim Differerence As Long

    Differerence = GetLocalToGMTDifference()
    ConvertGMTToLocal = DateAdd("s", Differerence, gmtTime)
End Function

'Purpose     :  Returns the time lDiff between local and GMT (secs).
'Inputs      :  dtLocalDate                 The local data time to return as GMT.
'Outputs     :  Returns the local time in GMT.
'Author      :  Andrew Baker
'Date        :  13/11/2002 10:16
'Notes       :  A positive number indicates your ahead of GMT.
'Revisions   :

Public Function GetLocalToGMTDifference() As Long
    Const TIME_ZONE_ID_INVALID& = &HFFFFFFFF
    Const TIME_ZONE_ID_STANDARD& = 1
    Const TIME_ZONE_ID_UNKNOWN& = 0
    Const TIME_ZONE_ID_DAYLIGHT& = 2

    Dim tTimeZoneInf As TIME_ZONE_INFORMATION
    Dim lRet As Long
    Dim lDiff As Long

    'Get time zone info
    lRet = GetTimeZoneInformation(tTimeZoneInf)

    'Convert diff to secs
    lDiff = -tTimeZoneInf.Bias * 60
    GetLocalToGMTDifference = lDiff

    'Check if we are in daylight saving time.
    If lRet = TIME_ZONE_ID_DAYLIGHT& Then
        'In daylight savings, apply the bias
        If tTimeZoneInf.DaylightDate.wMonth <> 0 Then
            'if tTimeZoneInf.DaylightDate.wMonth = 0 then the daylight
            'saving time change doesn't occur
            GetLocalToGMTDifference = lDiff - tTimeZoneInf.DaylightBias * 60
        End If
    End If
End Function

source:我相信第二个也使用第一个.

The second one I believe uses the first one as well.

任何一种都可以满足您的需求.

Either will suit your needs I believe.

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