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The time can be set from the Settings Menu > Device Info, while the date can be set through the searchbar (;setdate epoch), where expoch is the date/time in unix epoch format (date +%s).
(I might be dreaming the ;setdate searchbar command, but on the shell, setdate does work like that (and there's settz to fake a timezone, too)).
As for checking the date, besides checking the timestamps of stuff the framework dumps in the userstore, without a shell access, nope.
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