The T-SQL generates a simple Gregorian T-SQL containing the date of the month and the week of the year

-- Added the weekly times of the month and year of the date!
-- Sunday is counted as "last week "! (Note the differences between weekofyear, weekofmonth, myweekofyear, and myweekofmonth)
-- Note that the datename value varies depending on the SQL Server language version or date format!
-- The test environment is: SQL Server 2000 Simplified Chinese version + windows Simplified Chinese version

Declare @ datetime
Set @ = '2017-02-25 11:00:50 '-- 1995 is a Sunday.

Select @ as date
, Dateadd (year, datediff (year, 0, @), 0) the first day of the AS year
, Dateadd (year, 1 + datediff (year, 0, @), 0)-1 as the last day of the year
, Dateadd (quarter, datediff (quarter, 0, @), 0) the first day of the AS season
, Dateadd (quarter, 1 + datediff (quarter, 0, @), 0)-1 as the last day of the season
, Dateadd (month, datediff (month, 0, @), 0) the first day of the AS month
, Dateadd (month, 1 + datediff (month, 0, @), 0)-1 as the last day of the month
, Dateadd (Week, datediff (Week, 0, @), 0) the first day of the AS week
, Dateadd (week, 1 + datediff (Week, 0, @), 0)-1 as the last day of the week

Select
Dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) as [date]
, Datename (weekday, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) as [weekdayname]
, Datepart (weekday, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) as [weekday]
, (@ Datefirst + datepart (weekday, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) % 7 as [myweekday]

, Datepart (Week, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) as weekofyear
, Datediff (Week
, Case when (@ datefirst + datepart (weekday, dateadd (day, 0, datediff (day, 0, dateadd (year, datediff (year, 0 ,@), 0) % 7 = 1
Then dateadd (day,-1, dateadd (day, 0, datediff (day, 0, dateadd (year, datediff (year, 0, @), 0 ))))
Else dateadd (day, 0, datediff (day, 0, dateadd (year, datediff (year, 0, @), 0) -- the first day of the year where date is located: January 1, January 1
End
, Case when (@ datefirst + datepart (weekday, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) % 7 = 1
Then dateadd (day,-1, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0 ))))))
Else dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0 )))))
End
) + 1 as myweekofyear

, Datediff (Week, dateadd (day, 1-day (dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0), dateadd (day, 0, datediff (day, 0, dateadd (day, d. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0), dateadd (day, 0, datediff (day, 0, dateadd (day, d. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) + 1 as weekofmonth

, Datediff (Week
, Case when (@ datefirst + datepart (weekday, dateadd (month, datediff (month, 0, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) % 7 = 1
Then dateadd (month, datediff (month, 0, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0), 0)-1
Else dateadd (month, datediff (month, 0, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0), 0)
End
, Case when (@ datefirst + datepart (weekday, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) % 7 = 1
Then dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0)-1
Else dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0 )))))
End
) + 1 as myweekofmonth

, Datepart (dayofyear, dateadd (day, 0, datediff (day, 0, dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) as dayofyear

From
(
Select 0 as I
Union all select 1 Union all select 2 Union all select 3
Union all select 4 union all select 5 Union all select 6
Union all select 7 Union all Select 8 Union all select 9
Union all select 10 Union all select 11
) M
,
(
Select 0 as I
Union all select 1 Union all select 2 Union all select 3 Union all select 4 union all select 5
Union all select 6 Union all select 7 Union all Select 8 Union all select 9 Union all select 10
Union all select 11 union all select 12 Union all select 13 Union all select 14
Union all select 15 Union all select 16 Union all select 17 Union all select 18
Union all select 19 Union all select 20 Union all select 21 Union all select 22
Union all select 23 Union all select 24 Union all Select 25 Union all select 26
Union all select 27 Union all select 28 Union all select 29 Union all select 30
) D

Where datediff (month, dateadd (year, datediff (year, 0, @), 0), dateadd (day, D. i, dateadd (month, M. i, dateadd (year, datediff (year, 0, @), 0) = M. I
Order by [date]