Save and Get in ISO 8601 Format

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Save and Get in ISO 8601 Format

[advename]

So, I had some look at the code and just found a very bad Workaround, inside the plugin "acf-field-date-time-picker/date-time-picker-v4.php" :

function format_value_for_api( $value, $post_id, $field ) {

			$field = array_merge( $this->defaults, $field );
			if ( '' != $value && 'true' == $field['save_as_timestamp'] && 'true' != $field['get_as_timestamp'] && $this->isValidTimeStamp( $value ) ) {
				if ( 'true' == $field['show_date'] ) {
					$value = date_i18n( sprintf( '%s %s', $this->js_to_php_dateformat( $field['date_format'] ), $this->js_to_php_timeformat( $field['time_format'] ) ), $value );
				} else {
					$value = date_i18n( sprintf( '%s', $this->js_to_php_timeformat( $field['time_format'] ) ), $value );
				}
			}
			$value = preg_replace('/\s+/', '', $value);
			return $value;
		}

I simply added $value = preg_replace('/\s+/', '', $value); to the end, removing whitespaces, and now I can use yy-mm-dd"T" for date and HH:mm:ss for time to get the ISO format