Excel VBA - Using for/to/step generate list of dates between start/stop dates - excel

Question

I have written a macro to expand a range of start/stop dates by 5 minute increments and assigning a "campaign" number to each set of dates. For example, I have a table of dates:
Start
Stop
8/19/15 17:20
8/20/15 2:20
12/13/16 7:30
12/14/16 18:00
5/29/20 22:00
5/31/20 1:00
I want to expand each date range into a table at 5 minute increments (ie, 8/19/15 17:20, 8/19/15 17:25) then assign a label to each set (everything between 8/16/15 17:20 - 8/20/15 2:20 would be considered Campaign 1). I wrote the following code that works as planned, but when the macro gets to the 23:55 hour, the subsequent date is midnight of the previous day:
Date
8/19/15 23:50
8/19/15 23:55
8/19/15 00:00
8/20/15 00:05
Any thoughts on how to prevent the previous day showing up here?
Thanks
The code:
Sub campaignpull()
Dim ROWID As Integer
Dim LASTROW As Long
Dim rng As Range
Dim StartRng As Range
Dim EndRng As Range
ThisWorkbook.Sheets("Sheet1").Activate
LASTROW = ActiveSheet.UsedRange.Rows.Count
For ROWID = 2 To LASTROW
Set StartRng = Cells(ROWID, 1)
Set EndRng = Cells(ROWID, 2)
For i = StartRng To EndRng Step 1 / 24 / 12
ThisWorkbook.Sheets("Sheet2").Cells(Rows.Count, "A").End(xlUp).Offset(1, 0) = i
ThisWorkbook.Sheets("Sheet2").Cells(Rows.Count, "B").End(xlUp).Offset(1, 0) = ROWID - 1
Next
Next ROWID
End Sub

Answer 1

it seems Excel handles Date/Time in a different way than VBA. The solution I found was to use Excel formulas to create the 5 minutes increments. Please take a look at the code below:
Sub CampaignPull()
Dim rowCount As Integer
rowCount = Evaluate("COUNTA(Sheet1!A:A)")
Dim i As Integer
Dim j As Integer
j = 2
Dim startDateTime As Date
Dim endDateTime As Date
For i = 2 To rowCount
startDateTime = Sheets("Sheet1").Range("A" & i)
endDateTime = Sheets("Sheet1").Range("B" & i)
Sheets("Sheet2").Range("A" & j) = startDateTime
Do
j = j + 1
Sheets("Sheet2").Range("A" & j).Formula = "=A" & (j - 1) & "+1/12/24"
Loop While Sheets("Sheet2").Range("A" & j) <= endDateTime
Next i
End Sub

Answer 2

My take, although prior answer was good.
Do as you like with columns:
Sub campaignpull()
Dim rowId As Integer
Dim lastRow As Long
Dim rng As Range
Dim currentTime As Date
Dim endTime As Date
Dim i As Date
Dim rw As Integer
Sheet1.Activate
lastRow = ActiveSheet.UsedRange.Rows.Count
For rowId = 2 To lastRow
currentTime = Sheet1.Cells(rowId, 1).Value
endTime = Sheet1.Cells(rowId, 2).Value
rw = 1
Do Until currentTime > endTime
currentTime = currentTime + 1 / 24 / 12
Sheet2.Cells(rw, rowId) = currentTime
rw = rw + 1
Loop
Next rowId
End Sub