hcalendar-intro – Microformats
hCalendar is a method for adding additional mark-up to a page which contains details of one or more events, so that the event(s) can be identified by software, and indexed, searched or downloaded separately from the page itself.
This or a variant (such as a small sitemap style xml file) would work well for businesses to post their opening hours on their website, which could then be easily indexed by search engines.
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