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06.16.2008 at 08:41AM PDT, ID: 23488542
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9.6

Calculating an interval of time

Asked by sgaggerj in Microsoft Visual Basic.Net

Tags:

Hi all,

i need to figure out how to calculate an interval of time - in ms.
I am working on a backup project that the user will run, select the date and time of the next run and then start the program.
This program will run on that day and time, then reset and run again the same day and time the next week.


For example, the user starts the program on Monday, at 11:24 am.
They select Friday, at 20:30 (8:30 pm) and start the program.  The code below calculates the number of ms for the interval of the System.Timers.Timer
Friday at 20:30 comes, the program runs and resets itself to run the next friday at 20:30 (recalculating the new interval)

what i'm needing to calculate is the interval from when the user clicks 'start' until the program actually runs.

What I have so far is
2 combo-boxes
(DayBox)  with Sunday-Saturday, so that the indecies of the combobox correspond with Date.DayOfWeek values, ie Sunday=0, Monday=1, etc)

(TimeBox) with times (in 24h format, in 30 minute increments - ie 00:00, 00:30, 01:00 ...... 23:00,23:30)

The following code seems to work, but after writing it, it seems very cumbersome.
Does anyone have a simpler, or more elegant way to do this?
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Private Enum MSeconds
        Days = 86400000
        Hours = 3600000
        Minutes = 60000
        Seconds = 1000
End Enum
 
Private Function GetNextInterval() As Long
        Dim day As Integer = Now.DayOfWeek
        Dim day2 As Integer = DayBox.SelectedIndex
        Dim d As Integer = 0
        Dim h As Integer = CInt(Split(TimeBox.Text, ":")(0))
        Dim m As Integer = CInt(Split(TimeBox.Text, ":")(1))
        Dim s As Integer = 0
        ' number of days til next backup
        If day > day2 Then
            ' if today is past backup day
            d = 7 - (day - day2)
        ElseIf day2 > day Then
            d = day2 - day
        Else
            'day=day2
            Dim time As New Date(Now.Year, Now.Month, Now.Day, h, m, s)
            Dim ts As TimeSpan = time - Now
            If ts.TotalMilliseconds > 0 Then
                ' its passed already
                d = 6
            Else
                d = 0
            End If
        End If
 
        ' number of hours
        If h = 0 Then
            ' use 24
            If Now.Hour = 0 Then
                h = 0
            Else
                h = 24 - Now.Hour
            End If
        Else
            If h > Now.Hour Then
                h = h - Now.Hour
            ElseIf h < Now.Hour Then
                h = 24 - (Now.Hour - h)
            Else
                h = 0
            End If
        End If
        ' number of minutes
        If m = 0 Then
            ' use 60
            If m = Now.Minute Then
                m = 0
            Else
                m = 60 - m
            End If
        ElseIf m = 30 Then
            If m > Now.Minute Then
                m = 30 - Now.Minute
            Else
                m = 60 - (Now.Minute - m)
            End If
        End If
        ' number of secods - leave at 0
        s = 0
        Return d * MSeconds.Days + h * MSeconds.Hours + m * MSeconds.Minutes + s * MSeconds.Seconds
    End Function
[+][-]06.16.2008 at 08:55AM PDT, ID: 21794819

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[+][-]06.16.2008 at 09:03AM PDT, ID: 21794908

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[+][-]06.16.2008 at 09:11AM PDT, ID: 21794978

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[+][-]06.16.2008 at 10:48AM PDT, ID: 21795831

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[+][-]06.16.2008 at 11:10AM PDT, ID: 21796008

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About this solution

Zone: Microsoft Visual Basic.Net
Tags: Vb.Net 2005
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Solution Provided By: Idle_Mind
Participating Experts: 3
Solution Grade: A
 
 
[+][-]06.16.2008 at 11:11AM PDT, ID: 21796013

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[+][-]06.16.2008 at 12:44PM PDT, ID: 21796789

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[+][-]06.16.2008 at 12:55PM PDT, ID: 21796892

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[+][-]06.16.2008 at 01:05PM PDT, ID: 21796996

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[+][-]06.16.2008 at 01:13PM PDT, ID: 21797080

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