"MonthView"
Calendar on MS Office 2013

Option 2 | The "Monthview" Control doesn't currently exist

  1. Close Excel Application
  2. Download MSCOMCT2.cab (it's a cabinet file which extracts into two useful files)
  3. Extract MSCOMCT2.cab Files | the .inf file and the .ocx file
  4. Install | right-click the .inf file | hit "Install"

Additional Control
VBA UserFrom MS Office 2013

Option 3 | if The "Additional Control" doesn't currently exist or disable,
To enable "additional Control" on VBA UserForm you can Follow this step
  1. Open Excel Application
  2. Go to File -> Option -> Trust Center -> Trust Center Setting
  3. On ActiveX Setting Select "Enable All Control Without Prompting" and Press OK