Creating a Calendar in Access 2010 - ms-access

Question

I have been desperately trying to find a way to make a calendar in Access. I know it can be done, as I've seen wonderful examples, but I don't know how. (Also, my VB knowledge is minimal.)
Basically, I want the calendar to show a range of dates of when a program (we call them capsules) has been checked out, and when it will be returned.
DateReserve - the Date a capsule has been reserved
DateReturn - the Date when the capsule needs to be returned.
For example, if Capsule A is reserved on 6/1/2014 and will return 6/14/2014, I want the calendar to visually show that Capsule A will be unavailable during this time period. That way, we don't accidentally double-book a capsule.
Through one of my many google searches, I did find VB code that pulls up a very nice looking calendar. I just can't get the code right to visually show what dates a capsule will be unavailable.
Below is one of the sections of code I can't get to work right:
Private Sub OpenContinuousForm(ctlName As String)
Dim ctlValue As Integer
Dim DaysOfMonth As Long
Dim DateReturn As Date
Dim DateShipOut As Date
Dim DateRangeForProgram As String
DateRangeForProgram = (DateDiff("n", [DateReturn], [DateShipOut]))
On Error GoTo ErrorHandler
ctlValue = Me.Controls(ctlName).Tag
DaysOfMonth = MyArray(ctlValue - 1, 0)
DoCmd.OpenForm "frmCapsulesSchedule", acNormal, , [DateRangeForProgram] = DaysOfMonth
ExitSub:
Exit Sub
ErrorHandler:
MsgBox "DATE SHIP OUT FAILED.", , "Error!!!"
Resume ExitSub
End Sub
Please let me know if you need further information from me.

Answer 1

Here is the code I used for the calendar; Anywhere you see 'Teachers,' 'Schools,' or 'Capsules' would be where you'd put your own information:
Option Compare Database
Option Explicit
Private intYear As Integer
Private intMonth As Integer
Private lngFirstDayOfMonth As Long
Private intLastDayOfLastMonth As Integer
Private intFirstWeekday As Integer
Private intDaysInMonth As Integer
Private strFormReference As String
Private MyArray() As Variant
Private Sub cboMonth_Click()
On Error GoTo Errorhandler
Call Main
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Private Sub cboYear_AfterUpdate()
On Error GoTo Errorhandler
Call Main
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Private Sub Form_Load()
On Error GoTo Errorhandler
'Set the month and date to this current month and date
With Me
.cboMonth = Month(Date)
.cboYear = Year(Date)
End With
Call Main
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Public Sub InitVariables()
On Error GoTo Errorhandler
intYear = Me.cboYear
intMonth = Me.cboMonth
lngFirstDayOfMonth = CLng(DateSerial(intYear, intMonth, 1))
intFirstWeekday = getFirstWeekday(lngFirstDayOfMonth)
intDaysInMonth = getDaysInMonth(lngFirstDayOfMonth)
'This is where you add the reference for the form
'It is used in case we wish to add the module to a subform
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Public Sub Main()
On Error GoTo Errorhandler
Call InitVariables
Call InitArray
Call LoadArray
Call PrintArray
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Public Sub InitArray()
'First column will add all dates of the array
'Second column will add visible property
'Third column will hold the string variable
Dim i As Integer
On Error GoTo Errorhandler
ReDim MyArray(0 To 41, 0 To 3)
For i = 0 To 41
MyArray(i, 0) = lngFirstDayOfMonth + 1 - intFirstWeekday + i
If Month(MyArray(i, 0)) = intMonth Then
MyArray(i, 1) = True
'This works out the days of the month
MyArray(i, 2) = i + 2 - intFirstWeekday & vbNewLine
Else
MyArray(i, 1) = False
End If
Next i
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Public Sub LoadArray()
'This sub loads an array with the relevant variables from a query
Dim db As Database
Dim rs As Recordset
Dim rsFiltered As Recordset
Dim strQuery As String
Dim i As Integer
On Error GoTo ErrorHandler1
strQuery = "Select * FROM [qryDatesYearsCapsules2]"
Set db = CurrentDb
Set rs = db.OpenRecordset(strQuery)
With rs
If Not rs.BOF And Not rs.EOF Then
'Ensures the recordset contains records
On Error GoTo ErrorHandler2
For i = 0 To UBound(MyArray)
'Will loop through the array and use dates to filter down the query
'It firsts checks that the second column has true for its visible property
If MyArray(i, 1) = True Then
.Filter = "[NewDate]=" & MyArray(i, 0)
'To filter you must open a secondary recordset and
'Use that as the basis for a query
'This makes sense as you are building a query on a query
Set rsFiltered = .OpenRecordset
If Not rsFiltered.BOF And Not rsFiltered.EOF Then
'If the recordset is not empty then you are able
'to extract the text from the values provided
Do While Not rsFiltered.EOF = True
MyArray(i, 2) = MyArray(i, 2) & rsFiltered!CapsuleSet
' MyArray(i, 2) = MyArray(i, 2) & vbNewLine & rsFiltered!Teacher
MyArray(i, 2) = MyArray(i, 2) & vbNewLine & rsFiltered!School
' MyArray(i, 2) = MyArray(i, 2) & " - " & rsFiltered!NewDate
MyArray(i, 2) = MyArray(i, 2) & vbNewLine & vbNewLine
rsFiltered.MoveNext
Loop
End If
End If
Next i
End If
.Close
End With
ExitSub:
Set db = Nothing
Set rs = Nothing
Exit Sub
ErrorHandler1:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
ErrorHandler2:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Public Sub PrintArray()
Dim strTextBox As String
Dim i As Integer
On Error GoTo Errorhandler
For i = 0 To 41
strTextBox = "txt" & CStr(i + 1)
With Me
Controls(strTextBox) = ""
Controls(strTextBox).tag = i + 1
Controls(strTextBox) = MyArray(i, 2)
'Debug.Print strTextBox
'MyArray(i, 2)
End With
Next i
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Private Sub OpenContinuousForm(ctlName As String)
Dim ctlValue As Integer
Dim DayOfMonth As Long
On Error GoTo Errorhandler
ctlValue = Me.Controls(ctlName).tag
DayOfMonth = MyArray(ctlValue - 1, 0)
DoCmd.OpenForm "frmClassDataEntry", acNormal, , "[NewDate]=" & DayOfMonth, , acDialog
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitSub
End Sub
Private Sub txt1_Click()
On Error GoTo Errorhandler
If Me.ActiveControl.Text <> "" Then
Call OpenContinuousForm(Me.ActiveControl.Name)
End If
ExitSub:
Exit Sub
Errorhandler:
MsgBox "There has been an error. Please reload form."
Resume ExitSub
End Sub
'Repeat the code for txt1_Click() all the ways to txt42_Click()
Private Sub Format()
Dim ctl As Control
Dim lngBackColor As Long
For Each ctl In Me.Detail.Controls
If DCount("*", "lstCapsules", "[Capsule]='" & ctl.Value & "'") = 0 Then
lngBackColor = 16777215
Else
lngBackColor = DLookup("Background", "lstCapsules", "[Capsule]='" & ctl.Value & "'")
End If
ctl.BackColor = lngBackColor
Next ctl
Set ctl = Nothing
End Sub
I also have a module called modFunctions:
Option Compare Database
Option Explicit
Public Function getFirstWeekday(lngFirstDayOfMonth As Long) As Integer
On Error GoTo Errorhandler
getFirstWeekday = -1
getFirstWeekday = Weekday(lngFirstDayOfMonth, vbMonday)
ExitFunction:
Exit Function
Errorhandler:
getFirstWeekday = 0
MsgBox "There has been an error. Please reload the form.", , "Error"
Resume ExitFunction
End Function
Public Function getDaysInMonth(lngFirstDayOfMonth As Long) As Integer
On Error GoTo Errorhandler
getDaysInMonth = -1
getDaysInMonth = DateDiff("d", lngFirstDayOfMonth, DateAdd("m", 1, lngFirstDayOfMonth))
ExitFunction:
Exit Function
Errorhandler:
getDaysInMonth = 0
MsgBox "Something is wrong with the DATES!.", , "Date Error"
Resume ExitFunction
End Function

Answer 2

There is a very useful youtube video I came across by Access All In One. Here is a link to the database used in the example

Answer 3

Your syntax in the Where condition of the openform command is incorrect.
It should be "[DateRangeForProgram]=" & DaysOfMonth, if the field your using to filter the form's recordsource is [DateRangeForProgram].
Also, if you're trying to open the form to multiple days, you should likely be using the Between operator. The datediff function's first argument specifies an interval, and your interval is minutes.
You should post the rest of the code so the entire scenario is clear.