When working with Axxon One, the user can choose the calendar type (Gregorian or Persian).

To select the calendar type, do the following:

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

2. Select the calendar type that is used in Axxon One from the Calendar type drop-down list (3). 

3. Click the Apply button to save the changes.
4. Restart Axxon One (see Shutting down an Axxon One Client, Starting an Axxon One Client).

When Axxon One is restarted, the selected calendar type will be applied.