get_weekstartend( string $mysqlstring, int|string $start_of_week = ” ): int[]

Source

function get_weekstartend( $mysqlstring, $start_of_week = '' ) {
	// MySQL string year.
	$my = substr( $mysqlstring, 0, 4 );

	// MySQL string month.
	$mm = substr( $mysqlstring, 8, 2 );

	// MySQL string day.
	$md = substr( $mysqlstring, 5, 2 );

	// The timestamp for MySQL string day.
	$day = mktime( 0, 0, 0, $md, $mm, $my );

	// The day of the week from the timestamp.
	$weekday = gmdate( 'w', $day );

	if ( ! is_numeric( $start_of_week ) ) {
		$start_of_week = get_option( 'start_of_week' );
	}

	if ( $weekday < $start_of_week ) {
		$weekday += 7;
	}

	// The most recent week start day on or before $day.
	$start = $day - DAY_IN_SECONDS * ( $weekday - $start_of_week );

	// $start + 1 week - 1 second.
	$end = $start + WEEK_IN_SECONDS - 1;
	return compact( 'start', 'end' );
}

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