Twenty Fourteen Error: Missing required field “updated” by google webmasters tools

you will find function twentyfourteen_posted_on at line on 108. Replace it with new one.
Notice word updated in below code.

function twentyfourteen_posted_on() {
    if ( is_sticky() && is_home() && ! is_paged() ) {
        echo '<span class="featured-post">' . __( 'Sticky', 'twentyfourteen' ) . '</span>';
    }

    // Set up and print post meta information.
    printf( '<span class="entry-date"><a href="%1$s" rel="bookmark"><time class="entry-date updated" datetime="%2$s">%3$s</time></a></span> <span class="byline"><span class="author vcard"><a class="url fn n" href="%4$s" rel="author">%5$s</a></span></span>',
        esc_url( get_permalink() ),
        esc_attr( get_the_date( 'c' ) ),
        esc_html( get_the_date() ),
        esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
        get_the_author()
    );
}