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';

Source: oreilly.com

Mysql first day of year

SELECT 
	* 
FROM `users` 
WHERE YEAR(created_at) = YEAR(now())

Source: nicesnippets.com

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