Creates a month calendar control for the GUI.
GUICtrlCreateMonthCal ( "text", left, top [, width [, height [, style = -1 [, exStyle = -1]]]] )
| text | The preselected date (always as "yyyy/mm/dd"). | 
| left | The left side of the control. If -1 is used then left will be computed according to GUICoordMode. | 
| top | The top of the control. If -1 is used then top will be computed according to GUICoordMode. | 
| width | [optional] The width of the control (default is the previously used width). | 
| height | [optional] The height of the control (default is the previously used height). | 
| style | [optional] Defines the style of the control. See GUI Control Styles Appendix. default (-1) : none. forced style : $WS_TABSTOP | 
| exStyle | [optional] Defines the extended style of the control. See Extended Style Table. default (-1) : WS_EX_CLIENTEDGE | 
| Success: | the identifier (controlID) of the new control. | 
| Failure: | 0. | 
To obtain the value of the control see GUICtrlRead().
Default resizing is $GUI_DOCKSIZE.
GUICoordMode (Option), GUICtrlRead, GUIGetMsg
#include <GUIConstantsEx.au3>
#include <MsgBoxConstants.au3>
Example()
Func Example()
    GUICreate("Get date", 210, 190)
    Local $idMC_Date = GUICtrlCreateMonthCal("1953/03/25", 10, 10)
    GUISetState(@SW_SHOW)
    ; Loop until the user exits.
    While 1
        Switch GUIGetMsg()
            Case $GUI_EVENT_CLOSE
                ExitLoop
            Case $idMC_Date
                MsgBox($MB_SYSTEMMODAL, "debug", "calendar clicked")
        EndSwitch
    WEnd
    MsgBox($MB_SYSTEMMODAL, "Date", GUICtrlRead($idMC_Date), 2)
EndFunc   ;==>Example