具有多个if要求的Excel Countif

I have an Excel document that has a date column (A) and a column containing strings (B) one one sheet. On another sheet, I am doing calculations. If the cell in column A is between DATE(2012,1,1) and DATE(2012,6,1) AND the same row in column B contains "string" in any part (I have an Excel document that has a date column