Sysdate

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A sysdate refers to the date on which a headmate entered the system. This may be by forming, walking in, or some other means. The headmate in question may consider or adopt this day as their "birthday".

Related Terms
CIEday is a similar term relating to daemons.

Plurpday refers to the day (that represents when) a system came into existence or the day a system celebrates said event.