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What function can be used to update a post's post date and time to the current date & time?
Call wp_update_post() with a special value for 'post_date' and 'post_date_gmt':
$time = current_time('mysql');
'ID' => 123, // ID of the post to update
'post_date' => $time,
'post_date_gmt' => get_gmt_from_date( $time )
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