Yes, getting a value and then using that value to update another post with the same data will fail, I don’t even need to test it. The reason is that when you use get_field(), even if you use the field key, the nested sub fields in it will be by field name and not field key, so it fails.
In your code example:
$date_meta = array(); $date_meta['field_5b21449202e42'] = 'date'; //event_date_type $date_meta['field_5b2145b902e43'] = array( //event_single_day // this is the field your are updating in the // update field call below 'field_5b21463202e44' => $date, //event_date 'field_5b2146c83d961' => array( //event_time 0 => array( 'field_5b2147733d964' => $time, //event_start_time 'field_5b2147af3d965' => $time, //event_end_time ) ) ); update_field( 'field_5b21463202e44', $date_meta, $id ); //event_date
field_5b21463202e44 looks like a nested repeater, see my notes above. Is this correct?
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