SDL Trados Studio has a long struggle with Windows Region & language setting --> Date & time Setting--> Calendar Type : Persian Shamsi (تقویم هجری شمسی)
This struggle seems to be ceased in first versions of SDL Trados Studio 2019, but with this last patch: SR2 - 15.2.5.2145, this problem shows up in a new form: When creating a new project, the preparation tasks, never ends. It stick at . . . say .. 93%, forever.