This is the only thing that makes sense to me, in the case of air filters.
What does it matter the date when you changed it last? Yes, you need to check the air filter, but depending on the conditions you ride in, it could need changing in a week, a month or a year. If you are in dusty conditions, or height of bug season, check it often. The length of time in service seems irrelevant to me, and having to open the air box to find when I last checked it doesn't make a lot of sense to me either. Only thing that matters is if it is clean and useable.
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