如何在VBA（Excel）中以毫秒为单位获取DateDiff-Value？

Question

我需要计算两个时间戳之间的差异，以毫秒为单位。不幸的是，VBA的DateDiff函数不提供这种精度。有没有解决方法？

Answer 1

您可以使用here描述的方法如下： -

创建一个名为StopWatch的新类模块将以下代码放在StopWatch类模块中：

Private mlngStart As Long
Private Declare Function GetTickCount Lib "kernel32" () As Long

Public Sub StartTimer()
    mlngStart = GetTickCount
End Sub

Public Function EndTimer() As Long
    EndTimer = (GetTickCount - mlngStart)
End Function

您使用以下代码：

Dim sw as StopWatch
Set sw = New StopWatch
sw.StartTimer

' Do whatever you want to time here

Debug.Print "That took: " & sw.EndTimer & "milliseconds"

其他方法描述了VBA定时器功能的使用，但这仅精确到百分之一秒（厘秒）。

Answer 2

如果您只需要以秒为单位的时间，则不需要TickCount API。您可以使用所有Office产品中存在的VBA.Timer方法。

Public Sub TestHarness()
    Dim fTimeStart As Single
    Dim fTimeEnd As Single
    fTimeStart = Timer
    SomeProcedure
    fTimeEnd = Timer
    Debug.Print Format$((fTimeEnd - fTimeStart) * 100!, "0.00 "" Centiseconds Elapsed""")
End Sub

Public Sub SomeProcedure()
    Dim i As Long, r As Double
    For i = 0& To 10000000
        r = Rnd
    Next
End Sub

Answer 3

如果您想要微秒钟，则需要GetTickCount和性能计数器。对于毫秒，您可以使用这样的东西..

'at the bigining of the module
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 Declare Sub GetLocalTime Lib "kernel32" (lpSystemTime As SYSTEMTIME)  


'In the Function where you need find diff
Dim sSysTime As SYSTEMTIME
Dim iStartSec As Long, iCurrentSec As Long    

GetLocalTime sSysTime
iStartSec = CLng(sSysTime.wSecond) * 1000 + sSysTime.wMilliseconds
'do your stuff spending few milliseconds
GetLocalTime sSysTime ' get the new time
iCurrentSec=CLng(sSysTime.wSecond) * 1000 + sSysTime.wMilliseconds
'Different between iStartSec and iCurrentSec will give you diff in MilliSecs

Answer 4

您还可以使用在单元格中计算的qazxsw poi公式：

=NOW()

Answer 5

抱歉醒来这篇旧帖子，但我得到了答案： 像这样为Millisecond写一个函数：

Dim ws As Worksheet
Set ws = Sheet1

 ws.Range("a1").formula = "=now()"
 ws.Range("a1").numberFormat = "dd/mm/yyyy h:mm:ss.000"
 Application.Wait Now() + TimeSerial(0, 0, 1)
 ws.Range("a2").formula = "=now()"
 ws.Range("a2").numberFormat = "dd/mm/yyyy h:mm:ss.000"
 ws.Range("a3").formula = "=a2-a1"
 ws.Range("a3").numberFormat = "h:mm:ss.000"
 var diff as double
 diff = ws.Range("a3")

在您的子中使用此功能：

Public Function TimeInMS() As String
TimeInMS = Strings.Format(Now, "HH:nn:ss") & "." & Strings.Right(Strings.Format(Timer, "#0.00"), 2) 
End Function    

Answer 6

除了AdamRalph（

Sub DisplayMS()
On Error Resume Next
Cancel = True
Cells(Rows.Count, 2).End(xlUp).Offset(1) = TimeInMS()
End Sub

）描述的方法，你可以这样做：

• 使用GetTickCount()和QueryPerformanceCounter() API函数 QueryPerformanceFrequency()
• 或者，对于无法访问Win32 API的环境（如VBScript），这个： How do you test running time of VBA code?（查看“高性能计时器”可安装COM对象的下载部分。它们是免费的。）