How can I create a calendar input in VBA Excel?

This is my first post here. I felt compelled to share as the loss of the calendar in Excel was a huge deal and this calendar SiddhartRout created is incredible. So, MANY thanks to @SiddhartRout for putting together this really amazing calendar. I made changes to the cosmetics but most of the underlying meat of it is still all Siddhart's work with some minor changes to meet my use case.

Cosmetic changes:

• Replaced ALL of the buttons with borderless labels so it looks a lot more like the Windows 10 calendar
• The border of the labels will appear/disappear on mouse enter/exit
• I grayed out days that aren't for the current month. The 'gray out' is a different color that matches better for each theme.
• Modified the theme colors to my liking. Added a label to click for cycling through the themes.
• Changed the font to Calibri
• added color change on mouse entry to month/year and arrow controls
• Use this site for all of you color code needs --> RGB Color Codes

Code Changes

• Optimized the Property Let Caltheme making it easier to setup and add theme colors or entirely new themes
• I couldn't get the 'ESC to exit' to work reliably so i replaced it with an 'X'. It stopped crashing as much as well.
• Removed the localization stuff as i'll never need it
• Changing from buttons to labels required modifying some object variables where needed throughout the project
• Added public variables used to store RGB values allowing use of theme colors throughout the project providing for more consistent and easier application of selected theme
• User selected theme stored in the hidden sheet so it's persistent between runs
• Removed the checkmark button & launch directly from a click on any day.

Screenshots of each theme:

Download link for code:

• Win10ExcelCal.xlsm

The sample file (added at the end of the post) has a Userform, Module and a Class Module. To incorporate this into your project, simply export the Userform, Module and the Class Module from the sample file and import it into your project.

Class Module Code

In the Class Module (Let's call it CalendarClass) paste this code

Public WithEvents CommandButtonEvents As MSForms.CommandButton

'~~> Unload the form when the user presses Escape
Private Sub CommandButtonEvents_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
    If Not f Is Nothing Then If KeyAscii = 27 Then Unload f
End Sub

'~~> This section delas with showing/displaying controls
'~~> and updating different labels
Private Sub CommandButtonEvents_Click()
    f.Label6.Caption = CommandButtonEvents.Tag

    If Left(CommandButtonEvents.Name, 1) = "Y" Then
        If Len(Trim(CommandButtonEvents.Caption)) <> 0 Then
            CurYear = Val(CommandButtonEvents.Caption)                
            With f
                .HideAllControls
                .ShowMonthControls

                .Label4.Caption = CurYear
                .Label5.Caption = 2

                .CommandButton1.Visible = False
                .CommandButton2.Visible = False
            End With
        End If
    ElseIf Left(CommandButtonEvents.Name, 1) = "M" Then
        Select Case UCase(CommandButtonEvents.Caption)
            Case "JAN": CurMonth = 1
            Case "FEB": CurMonth = 2
            Case "MAR": CurMonth = 3
            Case "APR": CurMonth = 4
            Case "MAY": CurMonth = 5
            Case "JUN": CurMonth = 6
            Case "JUL": CurMonth = 7
            Case "AUG": CurMonth = 8
            Case "SEP": CurMonth = 9
            Case "OCT": CurMonth = 10
            Case "NOV": CurMonth = 11
            Case "DEC": CurMonth = 12
        End Select

        f.HideAllControls
        f.ShowSpecificMonth
    End If
End Sub

Module Code

In the Module (Let's call it CalendarModule) paste this code

Option Explicit

Public Const GWL_STYLE = -16
Public Const WS_CAPTION = &HC00000

#If VBA7 Then
    #If Win64 Then
        Public Declare PtrSafe Function GetWindowLongPtr Lib "user32" Alias _
        "GetWindowLongPtrA" (ByVal hwnd As LongPtr, ByVal nIndex As Long) As LongPtr

        Public Declare PtrSafe Function SetWindowLongPtr Lib "user32" Alias _
        "SetWindowLongPtrA" (ByVal hwnd As LongPtr, ByVal nIndex As Long, _
        ByVal dwNewLong As LongPtr) As LongPtr
    #Else
        Public Declare PtrSafe Function GetWindowLongPtr Lib "user32" Alias _
        "GetWindowLongA" (ByVal hwnd As LongPtr, ByVal nIndex As Long) As LongPtr

        Private Declare Function SetWindowLongPtr Lib "user32" Alias _
        "SetWindowLongA" (ByVal hwnd As LongPtr, ByVal nIndex As Long, _
        ByVal dwNewLong As LongPtr) As LongPtr
    #End If

    Public Declare PtrSafe Function DrawMenuBar Lib "user32" _
    (ByVal hwnd As LongPtr) As LongPtr

    Private Declare PtrSafe Function FindWindow Lib "user32" Alias _
    "FindWindowA" (ByVal lpClassName As String, _
    ByVal lpWindowName As String) As LongPtr

    Private Declare PtrSafe Function SetTimer Lib "user32" _
    (ByVal hwnd As LongPtr, ByVal nIDEvent As LongPtr, _
    ByVal uElapse As LongPtr, ByVal lpTimerFunc As LongPtr) As LongPtr

    Public Declare PtrSafe Function KillTimer Lib "user32" _
    (ByVal hwnd As LongPtr, ByVal nIDEvent As LongPtr) As LongPtr

    Public TimerID As LongPtr

    Dim lngWindow As LongPtr, lFrmHdl As LongPtr
#Else

    Public Declare Function GetWindowLong _
    Lib "user32" Alias "GetWindowLongA" ( _
    ByVal hwnd As Long, ByVal nIndex As Long) As Long

    Public Declare Function SetWindowLong _
    Lib "user32" Alias "SetWindowLongA" ( _
    ByVal hwnd As Long, ByVal nIndex As Long, _
    ByVal dwNewLong As Long) As Long

    Public Declare Function DrawMenuBar _
    Lib "user32" (ByVal hwnd As Long) As Long

    Public Declare Function FindWindowA _
    Lib "user32" (ByVal lpClassName As String, _
    ByVal lpWindowName As String) As Long

    Public Declare Function SetTimer Lib "user32" ( _
    ByVal hwnd As Long, ByVal nIDEvent As Long, _
    ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long

    Public Declare Function KillTimer Lib "user32" ( _
    ByVal hwnd As Long, ByVal nIDEvent As Long) As Long

    Public TimerID As Long
    Dim lngWindow As Long, lFrmHdl As Long
#End If

Public TimerSeconds As Single, tim As Boolean
Public CurMonth As Integer, CurYear As Integer
Public frmYr As Integer, ToYr As Integer

Public f As frmCalendar

Enum CalendarThemes
    Venom = 0
    MartianRed = 1
    ArcticBlue = 2
    Greyscale = 3
End Enum

Sub Launch()
    Set f = frmCalendar

    With f
        .Caltheme = Greyscale
        .LongDateFormat = "dddd dd. mmmm yyyy" '"dddd mmmm dd, yyyy" etc
        .ShortDateFormat = "dd/mm/yyyy"  '"mm/dd/yyyy" or "d/m/y" etc
        .Show
    End With
End Sub

'~~> Hide the title bar of the userform
Sub HideTitleBar(frm As Object)
    #If VBA7 Then
        Dim lngWindow As LongPtr, lFrmHdl As LongPtr
        lFrmHdl = FindWindow(vbNullString, frm.Caption)
        lngWindow = GetWindowLongPtr(lFrmHdl, GWL_STYLE)
        lngWindow = lngWindow And (Not WS_CAPTION)
        Call SetWindowLongPtr(lFrmHdl, GWL_STYLE, lngWindow)
        Call DrawMenuBar(lFrmHdl)
    #Else
        Dim lngWindow As Long, lFrmHdl As Long
        lFrmHdl = FindWindow(vbNullString, frm.Caption)
        lngWindow = GetWindowLong(lFrmHdl, GWL_STYLE)
        lngWindow = lngWindow And (Not WS_CAPTION)
        Call SetWindowLong(lFrmHdl, GWL_STYLE, lngWindow)
        Call DrawMenuBar(lFrmHdl)
    #End If
End Sub

'~~> Start Timer
Sub StartTimer()
    '~~ Set the timer for 1 second
    TimerSeconds = 1
    TimerID = SetTimer(0&, 0&, TimerSeconds * 1000&, AddressOf TimerProc)
End Sub

'~~> End Timer
Sub EndTimer()
    On Error Resume Next
    KillTimer 0&, TimerID
End Sub

'~~> Update Time
#If VBA7 And Win64 Then ' 64 bit Excel under 64-bit windows  ' Use LongLong and LongPtr
    Public Sub TimerProc(ByVal hwnd As LongPtr, ByVal uMsg As LongLong, _
    ByVal nIDEvent As LongPtr, ByVal dwTimer As LongLong)
        frmCalendar.Label1.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(0)
        frmCalendar.Label2.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(1)
    End Sub
#ElseIf VBA7 Then ' 64 bit Excel in all environments
    Public Sub TimerProc(ByVal hwnd As LongPtr, ByVal uMsg As Long, _
    ByVal nIDEvent As LongPtr, ByVal dwTimer As Long)
        frmCalendar.Label1.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(0)
        frmCalendar.Label2.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(1)
    End Sub
#Else ' 32 bit Excel
    Public Sub TimerProc(ByVal hwnd As Long, ByVal uMsg As Long, _
    ByVal nIDEvent As Long, ByVal dwTimer As Long)
        frmCalendar.Label1.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(0)
        frmCalendar.Label2.Caption = Split(Format(Time, "h:mm:ss AM/PM"))(1)
    End Sub
#End If

'~~> Improvement suggested by T.M (https://stackoverflow.com/users/6460297/t-m)
'(1) Get weekday name
Function wday(ByVal wd&, ByVal lang As String) As String
    ' Purpose: get weekday in "DDD" format
    wday = Application.Text(DateSerial(6, 1, wd), cPattern(lang) & "ddd")    ' the first day in year 1906 starts with a Sunday
End Function

'~~> Improvement suggested by T.M (https://stackoverflow.com/users/6460297/t-m)
'(2) Get month name
Function mon(ByVal mo&, ByVal lang As String) As String
    ' Example call: mon(12, "1031") or mon(12, "de")
    mon = Application.Text(DateSerial(6, mo, 1), cPattern(lang) & "mmm")
End Function

'~~> Improvement suggested by T.M (https://stackoverflow.com/users/6460297/t-m)
'(3) International patterns
Function cPattern(ByVal ctry As String) As String
    ' Purpose: return country code pattern for above functions mon() and wday()
    ' Codes: see https://msdn.microsoft.com/en-us/library/dd318693(VS.85).aspx
    ctry = LCase(Trim(ctry))
    Select Case ctry
        Case "1033", "en-us": cPattern = "[$-409]" ' English (US)
        Case "1031", "de": cPattern = "[$-C07]" ' German
        Case "1034", "es": cPattern = "[$-C0A]" ' Spanish
        Case "1036", "fr": cPattern = "[$-80C]" ' French
        Case "1040", "it": cPattern = "[$-410]" ' Italian
        ' more ...
    End Select
End Function

Userform Code

The Userform (Let's call it frmCalendar) code is too big to be posted here. Please refer to the sample file.

Screenshot

Themes

Highlights

1. No need to register any dll/ocx.
2. Easily distributable. It is FREE.
3. No Administratior Rights required to use this.
4. You can select a skin for the calendar widget. One can choose from 4 themes Venom, MartianRed, ArticBlue and GreyScale.
5. Choose Language to see Month/Day name. Support for 4 languages.
6. Specify Long and Short date formats

Sample File

Sample File

Acknowlegements @Pᴇʜ, @chrisneilsen and @T.M. for suggesting improvements.

What's New:

Bugs reported by @RobinAipperspach and @Jose fixed

Get international day & month names

This answer is intended to be helpful to Sid's approach regarding internationalization; so it doesn't repeat the other code parts which I consider to be clear enough building a UserForm. If wanted, I can delete it after incorporation in Vers. 4.0.

Just in addition to Sid's valid solution I demonstrate a simplified code to get international weekday and month names - c.f. Dynamically display weekday names in native Excel language

Modified ChangeLanguage procedure in form's module frmCalendar

Sub ChangeLanguage(ByVal LCID As Long)
    Dim i&
    '~~> Week Day Name
     For i = 1 To 7
         Me.Controls("WD" & i).Caption = Left(wday(i, LCID), 2)
     Next i
    '~~> Month Name
     For i = 1 To 12
         Me.Controls("M" & i).Caption = Left(mon(i, LCID), 3)
     Next i
End Sub

Called Functions in CalendarModule

These three functions could replace the LanguageTranslations() function. Advantage: short code, less memory, easier maintenance, correct names

'(1) Get weekday name
Function wday(ByVal wd&, ByVal lang As String) As String
' Purpose: get weekday in "DDD" format
  wday = Application.Text(DateSerial(6, 1, wd), cPattern(lang) & "ddd")    ' the first day in year 1906 starts with a Sunday
End Function

'(2) Get month name
Function mon(ByVal mo&, ByVal lang As String) As String
' Example call: mon(12, "1031") or mon(12, "de")
  mon = Application.Text(DateSerial(6, mo, 1), cPattern(lang) & "mmm")
End Function

'(3) International patterns
Function cPattern(ByVal ctry As String) As String
' Purpose: return country code pattern for above functions mon() and wday()
' Codes: see https://msdn.microsoft.com/en-us/library/dd318693(VS.85).aspx
ctry = lcase(trim(ctry))
Select Case ctry
  Case "1033", "en-us"
    cPattern = "[$-409]" ' English (US)
  Case "1031", "de"
    cPattern = "[$-C07]" ' German
  Case "1034", "es"
    cPattern = "[$-C0A]" ' Spanish
  Case "1036", "fr"
    cPattern = "[$-80C]" ' French
  Case "1040", "it"
    cPattern = "[$-410]" ' Italian
' more ...
End Select
End Function