wp-includes/class-wp-date-query.php:887Builds a MySQL format date/time based on some query parameters.
$datetimestring|array$default_to_maxbooloptionalfalsestring|false public function build_mysql_datetime( $datetime, $default_to_max = false ) { if ( ! is_array( $datetime ) ) { /* * Try to parse some common date formats, so we can detect * the level of precision and support the 'inclusive' parameter. */ if ( preg_match( '/^(\d{4})$/', $datetime, $matches ) ) { // Y $datetime = array( 'year' => (int) $matches[1], ); } elseif ( preg_match( '/^(\d{4})\-(\d{2})$/', $datetime, $matches ) ) { // Y-m $datetime = array( 'year' => (int) $matches[1], 'month' => (int) $matches[2], ); } elseif ( preg_match( '/^(\d{4})\-(\d{2})\-(\d{2})$/', $datetime, $matches ) ) { // Y-m-d $datetime = array( 'year' => (int) $matches[1], 'month' => (int) $matches[2], 'day' => (int) $matches[3], ); } elseif ( preg_match( '/^(\d{4})\-(\d{2})\-(\d{2}) (\d{2}):(\d{2})$/', $datetime, $matches ) ) { // Y-m-d H:i $datetime = array( 'year' => (int) $matches[1], 'month' => (int) $matches[2], 'day' => (int) $matches[3], 'hour' => (int) $matches[4], 'minute' => (int) $matches[5], ); } // If no match is found, we don't support default_to_max. if ( ! is_array( $datetime ) ) { $wp_timezone = wp_timezone(); // Assume local timezone if not provided. $dt = date_create( $datetime, $wp_timezone ); if ( false === $dt ) { return gmdate( 'Y-m-d H:i:s', false ); } return $dt->setTimezone( $wp_timezone )->format( 'Y-m-d H:i:s' ); } } $datetime = array_map( 'absint', $datetime ); if ( ! isset( $datetime['year'] ) ) { $datetime['year'] = current_time( 'Y' ); } if ( ! isset( $datetime['month'] ) ) { $datetime['month'] = ( $default_to_max ) ? 12 : 1; } if ( ! isset( $datetime['day'] ) ) { $datetime['day'] = ( $default_to_max ) ? (int) gmdate( 't', mktime( 0, 0, 0, $datetime['month'], 1, $datetime['year'] ) ) : 1; } if ( ! isset( $datetime['hour'] ) ) { $datetime['hour'] = ( $default_to_max ) ? 23 : 0; } if ( ! isset( $datetime['minute'] ) ) { $datetime['minute'] = ( $default_to_max ) ? 59 : 0; } if ( ! isset( $datetime['second'] ) ) { $datetime['second'] = ( $default_to_max ) ? 59 : 0; }Introduced in 3.7.0. Unchanged from 6.7.7 through 7.1.0.
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src/wp-includes/class-wp-date-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.