Create a small printer which prints out a sticker with the current date, time, and maybe blank space to write extra information by hand. Perhaps also include a time display on the device because it knows that anyway.
Most tricky part is how the device gets programmed with the correct time. Wifi and NTP? Shortwave radio? Having a clock display might be enough to induce the user to manually program the correct time.
Motivation is to label foods being put in the refrigerator.
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