When you log into C4C with English language the Month view of Calendar starts from Sunday, but for Czech language the Month view starts from Monday.
Reproducing the Issue
Log in to C4C in English language.
Click on Calendar icon from left panel.
Switch to Month view.
The Calendar starts from Sunday.
Log in to C4C in Czech language.
Follow step 2 and 3.
The Calendar starts from Monday.
As part of globalization, Calendar shows the first day of month or week based on the country code and logon language. For English, Sunday is the first day of week and for Czech, Monday is the first day of week.
This is expected and correct system behavior.
language, country code , KBA , first day , week , month , LOD-CRM-CAL , Calendar Control , Problem