When correctly adding structured data for opening hours according the schema.org and tested with the Google Structured Data Testing Tool: (enter this URL: http://www.oldtownvethospital.com)

and shows up as “All good” in “VeterinaryCare (1)”.

The “Nu Html Checker” shows this as an error. According to W3schools, the <time> attribute cannot contain day names (Monday - Sunday).

Error: Bad value Mo-Fr 08:30-17:30 for attribute datetime on element time: The literal did not satisfy the time-datetime format.
From line 222, column 79; to line 222, column 137
naryCare"><time itemprop="openingHours" datetime="Mo-Fr 08:30-17:30">Mon -
Syntax of time-datetime:
One of the following: month, date, yearless date, time, local date and time, time-zone offset, global date and time, week, non-negative integer, or duration. For more information and examples, see the section on the datetime value in the HTML specification.

Thank you for your time

Pierre Cobbaert

Web Design & Programming