CREATE TABLE table_75385 ("Polling Firm" TEXT, "Date" TEXT, "PSD - PC" TEXT, "UDMR" TEXT, "Elena B\\u0103sescu" TEXT, "Others" TEXT, "Undecided" TEXT)

When the other is n/a and the psc-pc is 30% what is the date?
SELECT "Date" FROM table_75385 WHERE "Others" = 'n/a' AND "PSD - PC" = '30%'
SELECT "Date" FROM "table_75385" WHERE "Others" = 'n/a' AND "PSD - PC" = '30%'