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The HTML markup produced by this template includes an [[Wikipedia:hCalendar|hCalendar microformat]], which makes the event details [[Wikipedia:parsing|parsable]] by computers, either acting automatically to catalogue article across Wikipedia, or via a browser tool operated by a person, to (for example) add the subject to a calendar or diary application. Within the hCalendar is a [[Wikipedia:Geo (microformat)|Geo microformat]], which additionally makes the [[Wikipedia:geographic coordinate system|coordinates]] (latitude & longitude) parsable, so that they can be, say, looked up on a map, or downloaded to a [[Wikipedia:Global Positioning System|GPS]] unit. For more information about the use of [[Wikipedia:microformat|microformat]]s on Wikipedia, please see [[Wikipedia:WikiProject Microformats|the microformat project]].
Dates will only be included if you use {{tl|Start date}} or {{tl|End date}} (use the former for single dates, [[Wikipedia:WikiProject Microformats/dates|but do not use any of these if the date is before 1583 CE]]). {{tl|End date}} requires that a time be specified, but display of this time may be suppressed by adding {{para|nodate|yes}} to the end.