Week calculation from a specific period

Question

suppose the fiscal year is starting from July/1st to June/30th.

I have to calculate the week no. accordingly in SQL Server 2005.

Please Suggest!

Many Tha

Answer 1

If week 1 of your financial year is always 1st July to 7th July...

DECLARE
  @inputDate    DATETIME,
  @fYearStart   DATETIME,
  @weekNumber   INT
SET
  @inputDate    = getDate()
SET
  @fYearStart   = DATEADD(year, DATEDIFF(year, '20000101', DATEADD(month, -7, @inputDate)), '20000701')
SET
  @weekNumber   = DATEDIFF(day, @fYearStart, @inputDate) / 7 + 1

If your finacial weeks are always Sunday to Saturday...

DECLARE
  @inputDate    DATETIME,
  @fYearStart   DATETIME,
  @weekNumber   INT
SET
  @inputDate    = getDate()
SET
  @fYearStart   = DATEADD(year, DATEDIFF(year, '20000101', DATEADD(month, -7, @inputDate)), '20000701')
SET
  @weekNumber   = DATEDIFF(WEEK, @fYearStart, @inputDate)

One or other of these should be adaptable to your definition of week number.