When working with C-Werk, the user can choose the type of calendar used (Gregorian or Persian).

To select the interface language, complete the following steps:

1. Go to Settings → Options → Regional settings (1–2).
   

2. Select the calendar type that is used in C-Werk from the calendar drop-down list (3). 

   In the C-Werk VMS, time and date formats and values are defined on the OS level (4).

   
   

3. Click Apply to save the changes.
4. Restart C-Werk.

The newly selected calendar type will be applied once C-Werk is restarted.