Accounting Act Article 15
The beginning and the end of a fiscal year shall be determined by the Budget Act.A quarter of a fiscal year shall be three months beginning from the date in which the fiscal year is commenced.Each month of a fiscal year shall be determined according to calendar month.Each month shall be divided into three periods, namely the period from the 1st to the 10th day, the period from the 11th to the 20th day, and the period from the 21st to the last day of each month.Each month shall be sub-divided into the period of five days each as a sub-period, the 1st to the 5th day of each month is the first sub-period, and the 26th to the last day of each month is the last sub-period.Periods that do not commence with the first day of a fiscal year or the first day of calendar month, or months that are not consecutive, shall be determined pursuant to Article 121 to 123 of the Civil Code.