Last day of month in a WHERE clause

Hi all!Have looked a bit around to find something here, but only found something about how to calculate last day of month.Given this extremly simple table:CREATE TABLE [dbo].[a_dates]( [id] [int] NOT NULL, [Check_date] [datetime] NULL, CONSTRAINT [PK_a_dates] PRIMARY KEY CLUSTERED ( [id] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]What i need is to SELECT count(*) WHERE [Check_date] is last day in month including leap years etc.Best regardsEdvard Korsbæk