Adding a Pause Button into a time on excel

Hi,

I'm trying to create a lap time in Excel which also features a Pause button. So far, I have managed to create Start and Lap buttons, with the following code:

Sub StartButton_Click()
    Range("A:B").ClearContents
    Range("A1") = "Start"
    startTime = Timer
End Sub
---
Sub LapButton_Click()
    Dim finalTime As Single, lr As Long
    finalTime = Timer - startTime
    lr = Cells(Rows.Count, "A").End(xlUp).Row + 1
    Cells(lr, "A") = Format(finalTime, "0.000")
    If lr = 2 Then Cells(lr, "B") = Cells(lr, "A")
    If lr > 2 Then Cells(lr, "B") = Cells(lr, "A") - Cells(lr - 1, "A")
End Sub
---

I want to create a Pause button which - unsurprisingly! - will allow me to pause the timer when I press it, and then allow the timer to continue where it left off after pressing it again (or by pressing another button if need be). I want all the data from before the pause to be saved as well, as I'm taking averages of the most recent laps.

I've tried a couple of different codes but had nothing which works at all at the moment. Any suggestions / advice would be greatly appreciated!

Option Explicit

Dim CountDown As Date
Sub Timer()
    CountDown = Now + TimeValue("00:00:01")
    Application.OnTime CountDown, "Reset"
End Sub

Sub Reset()
Dim count As Range
    Set count = [A1] ' A1 contains the number of seconds for the countdown.
        count.Value = count.Value - 1
    If count <= 0 Then
        MsgBox "Countdown complete."
        Exit Sub
    End If
        Call Timer
End Sub

Sub DisableTimer()
    On Error Resume Next
    Application.OnTime EarliestTime:=CountDown, Procedure:="Reset", Schedule:=False
End Sub