Blog post date not in format required by schema.org

Question

I'm trying to display blog posts using the BlogPosting schema from Schema.org, but I am having difficulty getting the date to display in the required format.

Currently, the responsive_child_post_meta_data() function contains the following:

<time itemprop="datePublished">%2$s</time>

But when I try to validate the results using the W3 HTML Validator, I get the following error message:

Error: The text content of element time was not in the required format: The literal did not satisfy the time-datetime format. 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. 

Answer 1

Not sure what responsive_child_post_meta_data() is but I use this and it validates just fine:

<time itemprop="datePublished" class="published" datetime="<?php echo get_the_time('c'); ?>" content="<?php echo get_the_time('c'); ?>">
    <?php echo get_the_date(); ?>
</time>