指定日期，判断其所属年份是否为闰年

很早以前，写过一个函数，是获取二月份的天数。《https://www.cnblogs.com/insus/archive/2011/04/22/2025019.html 其中这个函数内就此相关的判断：

 

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Insus.NET
-- Create date: 2019-05-09
-- Update date: 2019-05-09
-- Description: 指定日期，判断其所属年份是否为闰年
-- =============================================

CREATE FUNCTION [dbo].[svf_IsLeapYear] ( 
    @InputDate    DATETIME 
)
RETURNS BIT
AS
BEGIN
    DECLARE @rtv BIT = 0
    
    IF (YEAR( @InputDate ) % 4 = 0 AND YEAR( @InputDate ) % 100 != 0) OR YEAR( @InputDate ) % 400 = 0
        SET @rtv = 1
    RETURN @rtv
END
GO

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