Hi I am new to programming and just started learning VBA for excel. I have a query regarding sorting of arrays. How do I sort an array containing dates? For example if I have an array containing the dates ("23-jul-13","11-jan-10","1-may-09","3-feb-04") how do I sort this array. I have searched all over the internet for answers but could only find code for sorting numbers. I have been racking my brains on this for 2 days but can't seem to get it.
Thanks
I have the code below which takes dates from a selected column but I am getting an error whenever I run it. I have been trying to figure out what's wrong with it for 2 days now. I didn't mention this code earlier as I though it would unnnecessarily add to the confusion. The sub GetUniqueAndCount works fine but it's the sort sub which is the problem as it doesn't accept the array passed to it as an argument.
Sub GetUniqueAndCount()
Dim d As Object, c As Range, k, tmp As String
Set d = CreateObject("scripting.dictionary")
'I will select the column of dates
For Each c In Selection
tmp = Trim(c.Value)
If Len(tmp) > 0 Then
If Year(DateValue(Format(tmp, "dd-mmm-yy"))) = 2013 Then
d(tmp) = d(tmp) + 1
End If
End If
Next c
i = 0
ReDim ThisArray(UBound(d.keys)) As Date
For Each k In d.keys
ThisArray(i) = DateValue(Format(k, "dd-mmm-yy"))
i = i + 1
Next k
Sort (ThisArray)
End Sub
Sub Sort(arr() As Date)
Dim Temp As Date
Dim i As Long
Dim j As Long
For j = 2 To UBound(arr)
Temp = arr(j)
For i = j - 1 To 1 Step -1
If (arr(i) <= Temp) Then GoTo 10
arr(i + 1) = arr(i)
Next i
i = 0
10 arr(i + 1) = Temp
Next j
End Sub
To sort an array in VBA, you need to write a code where you can match the first element of the array with the next one and inter-change them if the first one needs to come before. You need a FOR LOOP (For Next) for this and the UCASE function.
Sorting a range in VBA is done by the range. sort method. It is a property of the range method with which a user can sort a range in order. The arguments for this function are: Key1, Order1, Key2, Type, Order2, Key3, Order3, Header, OrderCustom, MatchCase, Orientation, SortMethod, DataOption1, DataOption2, DataOption3.
To sort a Python date string list using the sort function, you'll have to convert the dates in objects and apply the sort on them. For this you can use the key named attribute of the sort function and provide it a lambda that creates a datetime object for each date and compares them based on this date object.
Your Sort(arr() As Date)
works fine. The problem is with this line
Sort (ThisArray)
Change it to
Sort ThisArray
Also since you are storing Dates
in ThisArray
, I hope you have declared it as Date
?
Example
Sub Sample()
Dim ThisArray(1 To 5) As Date
ThisArray(1) = #12/13/2013#
ThisArray(2) = #12/13/2012#
ThisArray(3) = #12/13/2015#
ThisArray(4) = #12/13/2014#
ThisArray(5) = #12/13/2016#
SortAr ThisArray
For i = 1 To 5
Debug.Print ThisArray(i)
Next i
End Sub
Sub SortAr(arr() As Date)
Dim Temp As Date
Dim i As Long, j As Long
For j = 2 To UBound(arr)
Temp = arr(j)
For i = j - 1 To 1 Step -1
If (arr(i) <= Temp) Then GoTo 10
arr(i + 1) = arr(i)
Next i
i = 0
10: arr(i + 1) = Temp
Next j
End Sub
OUTPUT
13/12/2012
13/12/2013
13/12/2014
13/12/2015
13/12/2016
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