在哈里发国家中，工作与时间的体系采用伊斯兰历（希吉来历）。一个伊斯兰历年由354天组成，其中3天留给蒙福的开斋节，7天留给宰牲节。因此，剩下的344天将分配给4个学期，如下表所示：

The system of work and time in the Khilafah State is the Hijri calendar. The Hijri year is composed of 354 days with 3 days set aside for the days of the blessed Eid Al-Fitr and seven days for Eid Al-Adha. Thus 344 days remain to be divided between the 4 school terms as shown in the following chart:

第一学期课程每年从禁月穆哈兰月的第一天开始，为期83天，其中包括这段时间内的星期五，也包括本学期的期末考试期。因此，课程在开始后83天结束。随后，下一学期课程将在上一学期结束后放假3天后开始。

The first school course commences on the first day of Muharram Al-Haram every year for a period of 83 days including the Fridays occurring in that period; it also includes the final examination period of that term. The course therefore ends after 83 days from its start. Then the next course commences after a holiday of 3 days at the end of the previous term.

第四学期别具一格，因为它包含了斋月，以及开斋节和宰牲节这两个神圣的节日。一些学生或老师可能会把整个学期当作假期，用来履行朝觐或副朝的功课，或者外出旅行。也有人会在神圣的宰牲节假期中履行朝觐的功课，该假期共计7天。

The fourth term is a distinguished one as it includes the month of Ramadhan as well as blessed days of the Eids of Al-Fitr and Al-Adha. Some students or teachers may take the whole term as a holiday to perform the obligation of Hajj, or Umrah or to travel. Some may also perform the obligation of Hajj in the holiday of the blessed Eid Al-Adha which totals 7 days.