Function iso8601Date
Formats a date/time according to ISO 8601.
Example: YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)
		
		Package: Module\ContentSitemapXml
Copyright: four for business AG
Author: simon.sprankel@4fb.de
Author: marcus.gnass@4fb.de
Located at data/examples/data/modules/content_sitemap_xml/php/content_sitemap_xml_output.php
	
	Copyright: four for business AG
Author: simon.sprankel@4fb.de
Author: marcus.gnass@4fb.de
Located at data/examples/data/modules/content_sitemap_xml/php/content_sitemap_xml_output.php
| integer | $time | a UNIX timestamp | 
| 
			string
		 | the formatted date string |