With the <time> HTML5 element we can represent any human-readable date and time to machines and make it more semantic.
The use case with the <time> tag is like any other new HTML5 element; you can make your code more readable for the crawlers. If you use this in a <article> tag, it means your publication date and the search engines displays in the result lists.
It is an inline element, and the support is almost 100%.
Usage
The most straightforward usage is to define a generic date format based on ISO 8601 standard.
<time>2017-11-27</time>
As you see this definition is not so flexible because you only define one type of mask. To use different formats, we have to apply the datetime attribute with a correct ISO date; inside of the tag, we can set any other display type without any restriction.
<time datetime="2017-11-27">27.11.2017.</time> <time datetime="2017-11-28">Tomorrow</time>
Mark Time
As I mentioned above, you can also set just time, or you can combine date with time with the T character.
<time>16:10:20</time> <time datetime="12:00">Noon</time>
And an example of the combination:
<time datetime="2017-12-03T10:30:00">Sunday, 10:30</time>
Summary
The <time> element is a simple and great way to upgrade your HTML code with some semantics.