Sorry. I just found out that the default date format of Taiwan is DD/MM/YYYY. Apparently Apple is not doing its job well. I altered the date format and my problem fixed. Thank you for your help.

Thank you for the solution. But it does not really work. At first I switched my region from Taiwan to Japan, both Countries having default date format YYYY/MM/DD. Then iCompta showed dates in correct format. But when I switched the region back to Taiwan, iCompta showed the reverse order again. Being...

I just upgraded from V4 to V6, or 6.0.14 (1298) to be precisely. The current date format is dd/mm/yyyy, and I want it to be yyyy/mm/dd, which is also my system default. I am frustrated because I spent 30 minutes and yet I can not find the right place to change it. Any clue please?