searching for ;date used to work. But Amazon seem to have hidden it. Most Kindles only allow setting the time. The date is set from WiFi and/or Mobile/Cell. It typically resets to 1970 if the battery (really a cell) goes flat. You need to turn on WiFi or Mobile and it can take minutes to a day to fix the date.
Wrong date messes up sort / recent but shouldn't hide ebooks. That sounds like a Filter.
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