是否可以更改 Sql Server 中的数据类型日期 [英] Is it possible to change the datatype Date in Sql Server
问题描述
我住在伊朗,我们在伊朗这里使用阳历而不是公历.是否可以将 Date
数据类型从公历日期更改为太阳日期.另外,我想在查询中使用 DateAdd() 、 DateDiff() 、 .. 等日期函数.
I live in Iran and we here in Iran use Solar dates instead of the Gregorian dates. Is it possible to change Date
datatype from Gregorian date to Solar date. Also, I want to use the date function such as DateAdd() , DateDiff() , .. in my query.
太阳日期的月份描述:
1- 31 day
2- 31 day
3- 31 day
4- 31 day
5- 31 day
6- 31 day
7- 30 day
8- 30 day
9- 30 day
10- 30 day
11- 30 day
12- 29 day (in Leap year 30 day)
SUM-365 day in each year
太阳日期的开始是每个公历日期的 23-3-....
and start of solar date is 23-3-... of each Gregorian date.
编辑 1
我在 SQL Server 中使用以下函数将公历日期转换为太阳日期:
I use below function in SQL Server for convert gregorian date to solar date:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER FUNCTION [dbo].[PersianDate]
(@MiladiDate DATE)
returns varchar(10)
AS
BEGIN
Declare @days int
Declare @year int
set @year=Year(@MiladiDate)
Declare @month int
Set @days=DATEDIFF ( day , Convert(Date,cast(Year(@MiladiDate) as varchar)+'/1/1'), @MiladiDate)+1
if @days>79 --یعنی یک فروردین ماه
begin
set @days=@days-79
if @days<=186
begin
set @month=@days/31;
if (@days%31=0)
set @days=31
else
begin
set @month=@month+1
set @days=@days%31
end
end
else
begin
set @days=@days-186
set @month=6+@days/30;
if (@days%30=0)
set @days=30
else
begin
set @month=@month+1
set @days=@days%30
end
end
set @year=@Year-621
end
else
begin
set @year=@year-1
if (((@Year % 100)<> 0 and (@Year % 4) = 0) or ((@Year % 100)= 0 and (@Year % 400) = 0))
set @days=@days+11
else
set @days=@days+10
set @month=@days/30+9
if (@days%30=0)
set @days=30
else
begin
set @month=@month+1
set @days=@days%30
end
set @year=@year-621
end
RETURN cast (@year as varchar)+'/'+
case
when @month<10 then '0'
else ''
END
+ cast (@month as varchar)+'/'+
case
when @days<10 then '0'
else ''
END
+ cast (@days as varchar)
END
编辑 2
为了将太阳日期转换为公历日期可以使用 CLR 函数:
For convert solar date to gregorian date can use CLR function:
推荐答案
您不能将 Date 数据类型日历从 gregorian 更改为 Solar.
You cannot change the Date datatype calender from gregorian to solar.
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