<?php if ( is_single() ) : ?>

      <span itemprop="author">
        <span itemprop="name">
          <?php the_author() ?>
        </span>
      </span>, in category «<?php the_category(', ') ?>»,
  <time itemprop="datePublished" datetime="<?php the_time('c'); ?>">
  <?php the_time('F j, Y') ?>
  </time>

<?php else : ?>

Page, updated at: <time itemprop="dateModified" datetime="<?php the_modified_time('c'); ?>">
    <?php the_modified_date('F j, Y'); ?>
      </time>

            <?php endif; ?>