22/7 in the day/month format. Since the fraction 22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.
http://en.wikipedia.org/wiki/Pi_Approximation_Day
System Administrator Appreciation Day, also known as Sysadmin Day, SysAdminDay, or Sysmas, is an annual event created by system administrator Ted Kekatos. The event exists to show appreciation for the work of sysadmins and other IT workers. It is celebrated on the last Friday in July.
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