Alternatively, I used the get_post_meta() function inside acf/update_value. This give me “$original” value.
Example:
function my_acf_update_value( $value, $post_id, $field, $original ) {
$ex_meta = get_post_meta( $post_id, 'META_FIELD_NAME', true );
if ( $ex_meta == 'SOME_EX_VAL' ) {
# some code....
}
return $value;
}
add_filter('acf/update_value/name=date_expir', 'my_acf_update_value', 20, 4);