The frame
The Met's timeline bar marks "Fatimid caliphate, 969-1171" both on the page for Egypt, 500-1000 CE, and on the page for 1000-1400. According to the events of 969-973, the Fatimid army conquered Egypt and founded the city of Cairo (al-Qahira, "the triumphant"), which was established as the new capital. At the end of the period, according to the events of 1160-1171, Saladin declared the Fatimid caliphate at an end in 1171 and established the Ayyubid dynasty. Sources 1, 2.
Boundaries and overlaps
The sources read do not disagree on the boundaries of the period: UNESCO's "Historic Cairo" page also dates Fatimid architecture to 969-1171. The boundaries are nonetheless boundaries of rule, not of events: the conquest event runs to 973, and the event of Saladin's rise is dated 1160-1171, so it begins within the period. A building built in the period may go on being used after it; the end of the period is not the end of its use. Sources 2, 3.
On this site
Three articles are placed in this period. "Cairo and al-Azhar: a city, a mosque and a place of learning" separates the founding of the city, the founding of the mosque and the stages of the institution of learning, to which the sources give different dates. "The mosque of al-Hakim: a mosque in Fatimid ceremony" deals with the mosque begun by al-'Aziz and rededicated by al-Hakim, and with its role in Fatimid ceremonial and procession. "The Fatimid gates of Cairo: architects from Edessa and the city walls" deals with the gates commissioned by the amir and vizier Badr al-Jamali in 1087 and 1092. Sources 1, 2.