SQL获取本周，上周，本月，上月的开始时间和结束时间

DECLARE @ThisWeekStartTime NVARCHAR(100),@ThisWeekEndTime NVARCHAR(100),--本周
            @LastWeekStartTime NVARCHAR(100),@LastWeekEndTime NVARCHAR(100),--上周
            @ThisMonthStartTime NVARCHAR(100),@ThisMonthEndTime  NVARCHAR(100),--本月
            @LastMonthSartTime NVARCHAR(100),@LastMonthEndTime NVARCHAR(100),--上月
            @LastestHalfYearStartTime NVARCHAR(100),@LastestHalfYearEndTime NVARCHAR(100),--近半年
            @LastestOneYearStartTime NVARCHAR(100),@LastestOneYearEndTime NVARCHAR(100)--近一年
            
    SELECT @ThisWeekStartTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -1, getdate()) ), 0),121)--本周开始时间
    SELECT @ThisWeekEndTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -1, getdate()) ), 6),121)--本周结束时间
    
    SELECT @LastWeekStartTime=  CONVERT(nvarchar(10),DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -7, getdate()) ), 0),121)--上周开始时间
    SELECT @LastWeekEndTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -7, getdate()) ), 6),121)--上周结束时间
     
    SELECT @ThisMonthStartTime=CONVERT(nvarchar(10),dateadd(dd,-day(getdate())+1,getdate()),121)--本月开始时间
    SELECT @ThisMonthEndTime=CONVERT(nvarchar(10),dateadd(dd,-day(getdate()),dateadd(m,1,getdate())),121)--本月结束时间
    
    SELECT @LastMonthSartTime=CONVERT(nvarchar(10),dateadd(dd,-day(dateadd(month,-1,getdate()))+1,dateadd(month,-1,getdate())),121)--上月开始时间
    SELECT @LastMonthEndTime= CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121) --上月结束时间
 
    SELECT @LastestHalfYearStartTime= CONVERT(nvarchar(10),  dateadd(dd,-day(dateadd(month,-6,getdate()))+1,dateadd(month,-6,getdate())) ,121)--近半年开始时间
    SELECT @LastestHalfYearEndTime=CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121)--近半年结束时间
    
    SELECT @LastestOneYearStartTime= CONVERT(nvarchar(10), dateadd(dd,-day(dateadd(month,-12,getdate()))+1,dateadd(month,-12,getdate())) ,121)--近一年开始时间
    SELECT @LastestOneYearEndTime=CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121)--近一年结束时间

当前时间 select getdate()
当前时间周的起始日期（以周一为例）select DATEADD(week,DATEDIFF(week,0,getdate()),0)
上周起始：select dateadd(week,-1,DATEADD(week,DATEDIFF(week,0,getdate()),0))
上上周起始：select dateadd(week,-2,DATEADD(week,DATEDIFF(week,0,getdate()),0))
上上上周起始：select dateadd(week,-3,DATEADD(week,DATEDIFF(week,0,getdate()),0))

--http://zarez.net/?p=2543

SELECT DATEADD(wk, -1, DATEADD(DAY, 1-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --first day previous week
SELECT DATEADD(wk, 0, DATEADD(DAY, 1-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --first day current week
SELECT DATEADD(wk, 1, DATEADD(DAY, 1-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --first day next week

SELECT DATEADD(wk, 0, DATEADD(DAY, 0-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --last day previous week
SELECT DATEADD(wk, 1, DATEADD(DAY, 0-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --last day current week
SELECT DATEADD(wk, 2, DATEADD(DAY, 0-DATEPART(WEEKDAY, GETDATE()), DATEDIFF(dd, 0, GETDATE()))) --last day next week

The results for week number and day of the week depend on your language settings.

In SQL Server the values for the days of the week are the following:

1 - Monday
2 – Tuesday
3 – Wednesday
4 - Thursday
5 – Friday
6 – Saturday
7 – Sunday

For example, for us_english language setting your session’s DATEFIRST setting has a default value 7 (it means that Sunday is the first day of the week), and for German it is 1 (Monday is the first day of the week):

SET LANGUAGE us_english;
SELECT @@DATEFIRST;

SET LANGUAGE German;
SELECT @@DATEFIRST;

language_setting_datefirst

To change the DATEFIRST setting for a session without changing the language setting, use the SET DATEFIRST command.
The DATEFIRST statement sets the first day of the week for the session to a number from 1 through 7.
For example, to set the first day of the week to 5 (Friday), use the following command:

SET DATEFIRST 5;

来源：oschina

链接：https://my.oschina.net/ethanleellj/blog/3158454

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SQL Server

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