Ah, so what you’re saying is that you want to delete all the text (including deleting the post categories/tags and author) but just leave the date?
If so, then I think the easiest way would be to edit class-content-post_metas.php and change this:
// Translators: 1 is category, 2 is tag, 3 is the date and 4 is the author's name.
if ( $tag_list ) {
$utility_text = __( 'This entry was posted in %1$s and tagged %2$s on %3$s<span class="by-author"> by %4$s</span>.' , 'customizr' );
} elseif ( $categories_list ) {
$utility_text = __( 'This entry was posted in %1$s on %3$s<span class="by-author"> by %4$s</span>.' , 'customizr' );
} else {
$utility_text = __( 'This entry was posted on %3$s<span class="by-author"> by %4$s</span>.' , 'customizr' );
}
to this:
// Translators: 1 is category, 2 is tag, 3 is the date and 4 is the author's name.
if ( $tag_list ) {
$utility_text = __( '%3$s' , 'customizr' );
} elseif ( $categories_list ) {
$utility_text = __( '%3$s' , 'customizr' );
} else {
$utility_text = __( '%3$s' , 'customizr' );
}