RewriteRule ^notes/([0-9]{4})/?$ /index.php?year=$1 [L]
RewriteRule ^notes/([0-9]{4})/([0-9]{2})/?$ /index.php?year=$1&month=$2 [L]
RewriteRule ^notes/([0-9]{4})/([0-9]{2})/([0-9]{2})/?$ /index.php?year=$1&month=$2&day=$3 [L]
RewriteRule ^notes/([0-9]{4})/?$ /index.php?year=$1 [L]
RewriteRule ^notes/([0-9]{4})/([0-9]{2})/?$ /index.php?year=$1&month=$2 [L]
RewriteRule ^notes/([0-9]{4})/([0-9]{2})/([0-9]{2})/?$ /index.php?year=$1&month=$2&day=$3 [L]