I've got egg on my face because Steam's Personal Calendar feature has apparently been a test this whole time and is only now actually a fully fledged component - Rock Paper Shotgun

Automated excerpt

I'll be honest folks: I didn't know that Steam's Personal Calendar feature was still technically in testing. Yet lo and behold, a post from Valve went out yesterday announcing that the feature has launched out of Steam Labs "and is considered a full feature of the Steam Store." The feature, if you've missed it, is "another way to see recommended games for you, showing both recently released and upcoming games filtered down to the set of games we think you are most likely to be interested in," as Valve explain it anyway.

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