Environment.TickCount is not enough

Question

I want to know on when was the last time the system was started.

Environment.TickCount will work but it is breaking after 48-49 days because of the limitation of int

Answer 1

I think it's just the way they have implemented it.

It goes from 0 to max and then goes from min to 0.

https://msdn.microsoft.com/en-us/library/system.environment.tickcount(v=vs.110).aspx

I have edited the code you are using from http://www.codeproject.com/Articles/13384/Getting-the-user-idle-time-with-C

Why don't you just get the Absolute number?

    Public Shared Function GetIdle() As UInteger
        Dim lii As New LASTINPUTINFO()
        lii.cbSize = Convert.ToUInt32((Marshal.SizeOf(lii)))
        GetLastInputInfo(lii)

        Dim totalTicks As Long = 0

        If Environment.TickCount > 0 Then
            totalTicks = Convert.ToUInt64(Environment.TickCount)
        Else
            totalTicks = Convert.ToUInt64(Environment.TickCount * -1)
        End If

        Return Math.Abs(totalTicks - lii.dwTime)

    End Function