How to check whether this is today's first login?

I have a couple things I'd like to script on login, but only once per day (second and further uses are a waste). Surely there's got to be some simple way to answer, "Has this character already logged in today?" How's Mafia do it for breakfasting and such?
 
Preferences prefixed with "_" will be cleared each day, so you can make up your own preference and check whether it's empty or not (e.g. get_property("_didStuff") == "")
 
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