CREATE TABLE table_39237 ("Date" CLOB, "Venue" CLOB, "Score" CLOB, "Result" CLOB, "Competition" CLOB)

What date has a competition of 2012 afc challenge cup, and dasarath rangasala stadium, kathmandu as the venue?
SELECT "Date" FROM table_39237 WHERE "Competition" = '2012 afc challenge cup' AND "Venue" = 'dasarath rangasala stadium, kathmandu'
SELECT "Date" FROM "table_39237" WHERE "Competition" = '2012 afc challenge cup' AND "Venue" = 'dasarath rangasala stadium, kathmandu'