In the sandbox environment, while changing the region to Arabic (Saudi Arabia) system updates the accounting period which is defined as the current year updates to the future period of the year 2045. If I change again to the US version then again period came back to this year as we defined 2023.

Second, month names do not corroborate with the period defined I gave 01 (January) as a month, the name is coming March in the calendar year defining, it is due to the mixing of the Islamic calendar and Gregorian calendar on the forms.

Islamic calendar may vary dates according to the moon every month, So the calendar month changes.