Date and time "stamping" on digital files sometimes is important, i.e., document birth of an animal, bird, flower blooms, etc. Another instance: possible legal evidence authentication - the location of an object, person, accident scene, or event on a given date and place.
Noticed my Canon 5D was (surprisingly) not programmed for February's leap-year date - images were erroneously dated. Caught the date issue when reseting the Daylight Times Savings change in the camera (two weeks later; posted time was also slow by 3 minutes since the last change only 6 months previous).
None of the above is earth-shattering, simply a heads-up, particularly on the calendar date.
In addition...if you cross time zones, change it then also. When I went
to New Mexico from Ohio, I forgot about the 2-3 hour time difference. Now
everytime I look at my exif data, I have to remind myself that those times
are wrong.
Camera correction: leap year + time switch
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