CREATE TABLE table_6210 ("Date" CLOB, "Course" CLOB, "Distance" CLOB, "Type" CLOB, "Winner" CLOB)

What is the date for the La Granja de San Ildefonso to Alto de Navacerrada course?
SELECT "Date" FROM table_6210 WHERE "Course" = 'la granja de san ildefonso to alto de navacerrada'
SELECT "Date" FROM "table_6210" WHERE "Course" = 'la granja de san ildefonso to alto de navacerrada'