Solution : https://service.sap.com/sap/support/notes/884786 (SAP Service marketplace login required)
Key words : 
html andthe calendar control, calendar control property, /3 kernel patch 30if, calendar control, /3 kernel patch 98, dump arises, method flush, class cl_gui_cfw, cntl_error exception, automation error
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 335521 | ITS patch installation of kernel files | 
| 330793 | Downloading patches |