Split and calculate string vb.net - vb.net

Question

I have kind of difficult question.
I have a a string like
2021-09-24 00:52:27
2021-09-23 03:46:08
2021-09-22 04:13:03
2021-09-21 04:08:02
2021-09-20 02:13:27
2021-09-19 05:27:38
2021-09-18 03:43:32
2021-09-17 03:23:44
I need to count the timespan of a last week.
The thing the string not always will be the last 7 days
so i made a string to get the last 7 days and compare them and if a line isnat matching the date it will be 00:00:00,
before that i splited the string.
before that i declared X as a number of lines in the string
2021-09-24
2021-09-23
2021-09-22
2021-09-21
2021-09-20
2021-09-19
2021-09-18
2021-09-17
00:52:27
03:46:08
04:13:03
04:08:02
02:13:27
05:27:38
03:43:32
03:23:44
Dim x As String = RichTextBox4.Lines.Count ' The number of lines with date and hours together
Dim a1 As String = Date.Now.ToString("yyyy-MM") ' Creating dates for the last 7 days
Dim a2 As String = Date.Now.ToString("dd")
Dim b1 As String = Date.Now.ToString("yyyy-MM")
Dim b2 As String = Date.Now.ToString("dd") - 1
Dim c1 As String = Date.Now.ToString("yyyy-MM")
Dim c2 As String = Date.Now.ToString("dd") - 2
Dim dd1 As String = Date.Now.ToString("yyyy-MM")
Dim dd2 As String = Date.Now.ToString("dd") - 3
Dim e1 As String = Date.Now.ToString("yyyy-MM")
Dim e2 As String = Date.Now.ToString("dd") - 4
Dim f1 As String = Date.Now.ToString("yyyy-MM")
Dim f2 As String = Date.Now.ToString("dd") - 5
Dim g1 As String = Date.Now.ToString("yyyy-MM")
Dim g2 As String = Date.Now.ToString("dd") - 6
Dim d1 As String = a1 + "-" + a2
Dim d2 As String = b1 + "-" + b2
Dim d3 As String = c1 + "-" + c2
Dim d4 As String = dd1 + "-" + dd2
Dim d5 As String = e1 + "-" + e2
Dim d6 As String = f1 + "-" + f2
Dim d7 As String = g1 + "-" + g2
Dim lines11 = RichTextBox4.Lines
Dim modifiedLines11 = New List(Of String)()
For index11 As Integer = 0 To lines11.Length - 1
Dim url11 = lines11(index11).Substring(lines11(index11).LastIndexOf(" "c))
modifiedLines11.Insert(index11, lines11(index11).Replace(url11, String.Empty))
modifiedLines11.Add(url11)
RichTextBox4.Text = String.Join(Environment.NewLine, modifiedLines11)
Next
' after split to 2 lists in string
Dim o1 As String = RichTextBox4.Lines(0) ' The first lines of the string is the dates
Dim o2 As String = RichTextBox4.Lines(1)
Dim o3 As String = RichTextBox4.Lines(2)
Dim o4 As String = RichTextBox4.Lines(3)
Dim o5 As String = RichTextBox4.Lines(4)
Dim o6 As String = RichTextBox4.Lines(5)
Dim o7 As String = RichTextBox4.Lines(6)
Dim l1 As String ' This is the second list in the string those are the times
Dim l2 As String
Dim l3 As String
Dim l4 As String
Dim l5 As String
Dim l6 As String
Dim l7 As String
here im trying to compare it to the actual date and if isnt it will give me 00:00:00.
If o1 = d1 Then
l1 = RichTextBox4.Lines(x)
Else
l1 = "00:00:00"
If o2 = d2 Then
l2 = RichTextBox4.Lines(x + 1)
Else
l2 = "00:00:00"
If o3 = d3 Then
l3 = RichTextBox4.Lines(x + 2)
Else
l3 = "00:00:00"
If o4 = d4 Then
l4 = RichTextBox4.Lines(x + 3)
Else
l4 = "00:00:00"
If o5 = o5 Then
l5 = RichTextBox4.Lines(x + 4)
Else
l5 = "00:00:00"
If o6 = d6 Then
l6 = RichTextBox4.Lines(x + 5)
Else
l6 = "00:00:00"
If o7 = d7 Then
l7 = RichTextBox4.Lines(x + 6)
Else
l7 = "00:00:00"
End If
End If
End If
End If
End If
End If
End If
' here im trying to calculate the time.
Dim ts1 As TimeSpan = TimeSpan.Parse(l1)
Dim ts2 As TimeSpan = TimeSpan.Parse(l2)
Dim ts3 As TimeSpan = TimeSpan.Parse(l3)
Dim ts4 As TimeSpan = TimeSpan.Parse(l4)
Dim ts5 As TimeSpan = TimeSpan.Parse(l5)
Dim ts6 As TimeSpan = TimeSpan.Parse(l6)
Dim ts7 As TimeSpan = TimeSpan.Parse(l7)
Dim ttsum As TimeSpan = ts1 + ts2 + ts3 + ts4 + ts5 + ts6 + ts7
MsgBox(ttsum.ToString)
In my opinion the porblem with the code is or the method is bad or the if statements arent good with this method.

Answer 1

Since I don't see any AM/PM data, I am assuming the data in the rich text box is in 24 hour format.
Your code is so complicated because you are manipulate strings instead of dealing with dates. If you want to compare dates and manipulate dates, the first thing you need to do is turn your strings into dates. Since we do not know how many items we are dealing with we will use List(Of T).
Private Function GetListOfDates() As List(Of Date)
Dim lst As New List(Of Date)
Dim provider As CultureInfo = CultureInfo.InvariantCulture
For Each line In RichTextBox1.Lines
' 2021-09-17 03:23:44
lst.Add(Date.ParseExact(line, "yyyy-MM-dd hh:mm:ss", provider))
Next
Return lst
End Function
Next you need to filter the list for last week. For your purposes, a day starts as 00:00:00 and ends at 23:59:59
Private Function FilterListForLastWeek(lst As List(Of Date)) As List(Of Date)
Dim DatesInWeek As New List(Of Date)
'I hardcoded the following date to work with your sample data
Dim LastDayOfWeek = New Date(2021, 9, 24, 23, 59, 59)
'You would use the following code in the real version
'Dim LastDayOfWeek = New Date(Date.Now.Year, Date.Now.Month, Date.Now.Day, 23, 59, 59)
Debug.Print(LastDayOfWeek.ToString)
Dim FirstDayOfWeek = LastDayOfWeek.AddDays(-6)
FirstDayOfWeek = New Date(FirstDayOfWeek.Year, FirstDayOfWeek.Month, FirstDayOfWeek.Day, 0, 0, 0)
Debug.Print(FirstDayOfWeek.ToString)
For Each d In lst
If d >= FirstDayOfWeek AndAlso d <= LastDayOfWeek Then
DatesInWeek.Add(d)
End If
Next
Return DatesInWeek
End Function
It looks like you are considering the hour, minute, second portion of the date as a time span. To add TimeSpan you use the Add method. The last date in the data from the rich text box (the 17th) is excluded since it is not in the week (days 18-24 inclusive is 7 days). The message box displays 1:00:24:17 which is 1 day, zero hours, 24 minutes, and 17 seconds. You can also display as TotalHours, TotalMinutes, etc..
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim AllDates = GetListOfDates()
Dim DatesInWeek = FilterListForLastWeek(AllDates)
Dim TimeSpanSum As TimeSpan
For Each d In DatesInWeek
TimeSpanSum = TimeSpanSum.Add(New TimeSpan(d.Hour, d.Minute, d.Second))
Next
MessageBox.Show(TimeSpanSum.ToString)
End Sub