Re: How can I get the start date & end date of given week number or month

/* Determine the first week's last day of the week, weekday = 7 (Saturday) */

declare @current_year char(4)

declare @week1_lastday datetime

select @current_year = convert(varchar(4),datepart(yy,getdate()))

select @week1_lastday = dateadd(day,v.number,convert(datetime,'1/1/' + @current_year ))

from master..spt_values v

where v.type = 'P'

and  v.number between 0 and 6

and datepart(dw,dateadd(day,v.number,convert(datetime,'1/1/' + @current_year ))) = 7

/* Now, given any week number, add weeks to the date above to get last day, then subtract 6 days */

declare @given_weeknum tinyint

select @given_weeknum = 14

select given_weeknum = @given_weeknum, first_weekday = dateadd(dd,-6,dateadd(wk,@given_weeknum - 1,@week1_lastday))

given_weeknum first_weekday

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            14 Mar 27 2016 12:00AM

/* Generally, just list every first day of week for the year */

select week_num = v.number,

       first_weekday = dateadd(dd,-6,dateadd(wk,v.number - 1,@week1_lastday))

from master..spt_values v

where v.type = 'P'

and v.number between 1 and 53

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