How to show Published date and/or Modified date

This function should be displaying both modified and published dates only if they differ. 

    if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
        $time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time><time class="updated" datetime="%3$s">%4$s</time>';
    }

Dates are compared using timestamps and if they don’t match the string format is set to two <time> tags otherwise it’s just published date.

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