Represent dates and times following the Chicago Manual of Style with some modification.
For times on the hour, do not include the minutes, for example as “10 a.m.”. Removing the “:00” reduces noise for assistive technology.
Include the minutes for any times that are not on the hour, such as “1:30 p.m.”. Use “noon” and “midnight” instead of their more confusing numerical counterparts “12 a.m.” and “12 p.m.”.
Do not use a dash to represent a time or date range. Use the word “to”.
Libraries are closed for .
The event starts at
<time>10 a.m. to midnight</time>
<p>Libraries are closed for <time datetime="2019-01-21">Martin Luther King Day</time>.</p>
<p>The event starts at <time datetime="13:00">1 p.m.</time></p>