Format time as HTML5 element

The times can be formatted as a HTML5 element time or datetime:

A Valid Time
This should be a string specifying a time without a date and using the 24-hour format, in the form of HH:MM[:SS[.mmm]] where:

H stands for hours
M stands for minutes
S stands for seconds
m stands for milliseconds
The square brackets indicate the parts that are optional
An example of this format is shown below:

<!-- 16 hours and 10 minutes
    (or 4 hours and 10 minutes pm) -->
<time datetime="16:10">afternoon</time>
Another example is:

<!-- 18 hours, 20 minutes, and 30 seconds
    (or 6 hours, 20 minutes, and 30 seconds) -->
<time>18:20:30</time>

But first, see the Microdata issue.