I'm trying to create a schema.org definition for openinghours, which validates in Google's rich snippets testing tool.
With this markup I want to define that on mondays a shop is open from 11:00-22:00.
<time datetime="Mo 11:00-22:00" itemprop="openingHours">11:00-22:00</time>
However, the rich snippets testing tool displays:
Warning: openinghours refers to a datetime format that is not ISO 8601.
Schema.org defines:
The opening hours for a business. Opening hours can be specified as a weekly time range, starting with days, then times per day. Multiple days can be listed with commas ',' separating each day. Day or time ranges are specified using a hyphen '-'.
Days are specified using the following two-letter combinations: Mo, Tu, We, Th, Fr, Sa, Su.
Times are specified using 24:00 time. For example, 3pm is specified as 15:00.
Here is an example:
<time itemprop="openingHours" datetime="Tu,Th 16:00-20:00">Tuesdays and Thursdays 4-8pm</time>