A Calendar Year has 52 weeks plus one day in a normal year and plus 2 days in a leap year but Academic Years are based on units of weeks which causes the phenomenon of Calendar Drift.

Many Colleges start their Academic Year on the second Monday of every August; for such a College the second Monday in August falls on a range of dates between the 8th to the 14th August.

It takes five or six years for the second Monday of August to move between this range of dates – depending if there is one leap year or two in the period.

If an Academic Year starts on 8th August, then it will have an extra college week during that Academic Year relative to an Academic Year that starts on 15th August, this extra college week occurs once every five or six years.

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