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Date Subtraction

  • February 20, 2007 at 1:49 pm

    #68710

    I have a table with two columns, both of which are dates. What would the script be to subtract one from the other and return just the number of days difference between the two?

    Thanks...Nali

  • February 20, 2007 at 1:55 pm

    #690750

    Checkout the datediff function

  • February 20, 2007 at 3:05 pm

    #690766

    also the date add function accepts negative numbers, so if you need something like "15 days back from today":

    SELECT DATEADD(day, -14, getdate()) AS TwoWeeksAgo

    results:

    TwoWeeksAgo                                           

    ------------------------------------------------------

    2007-02-06 17:03:39.997

    (1 row(s) affected)

    Lowell

    --help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!

  • February 20, 2007 at 11:08 pm

    #690813

    To express the difference between two dates in days...

    DATEPART(dd,(DATEDIFF(@startdate,@enddate)))

    or

    DAY(DATEDIFF((@startdate,@enddate))

    Both are equivalent - it follows the SQL tradition of there always being more than one way to solve a problem

  • February 22, 2007 at 8:57 am

    #691190

    Yeah, both are equivalent: they are both syntax errors.

    How about: DATEDIFF(DAY, @startdate, @enddate)

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