SQL

mysql first day of year

SELECT DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0);			-- SQL Server
SELECT TRUNC(sysdate, 'YEAR') FROM DUAL;					-- Oracle
SELECT MAKEDATE(year(now()), 1);							-- MySQL

mysql first day of month

-- Replace curdate() with your date column
SELECT curdate(), 
	DATE_SUB( curdate(), INTERVAL DAYOFMONTH(curdate())-1 DAY ) AS '1st of month';

mysql first day of month date

DATE(FORMAT_DATE('%Y-%m-01', CURRENT_DATE() ))