@phoenix-systems I have kind of the same problem and I think I found the problem, and the solution.
I realized that updating a DatePicker field, requires you to pass the date with the ‘Ymd’ format (PHP) no matter what format you are using (they really should add it to the documentation).
my code: (dob = date of birth…)
$dob_str = '23/11/1984'; $date = DateTime::createFromFormat('d/m/Y', $dob_str); $date = $date->format('Ymd'); update_field('date_of_birth', $date, $post_id);
Also worth mentioning is that if you are trying to update a field with the same value (from the database) the function returns
false, but that’s WP behaviour if I’m not mistaken.
Hope it helps you.
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