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Thread: Subtract Weekdays From Set Date

  1. #1
    Join Date
    18th December 2007
    Posts
    5

    Subtract Weekdays From Set Date

    Hi everyone, very helpful site. I've never had to ask a question before as I have always been able to find a solution but I can't crack this one.

    I need a formula which counts back a set number of weekdays from a given date. Eg. I am supplied with a project end date and need to schedule 25 week days prior.

    I've searched a can only find formulas for the number of weekdays between 2 dates.

    There's is probably a very simple answer that I just can't see - hopefully.

    Thanks

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  2. #2
    Join Date
    24th January 2003
    Location
    Australia
    Posts
    31,717

    Re: Subtract Weekdays From Set Date

    NETWORKDAYS Function.

    NETWORKDAYS

    Returns the number of whole working days between start_date and end_date. Working days exclude weekends and any dates identified in holidays. Use NETWORKDAYS to calculate employee benefits that accrue based on the number of days worked during a specific term.

    If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.

    How?

    On the Tools menu, click Add-Ins.
    In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
    If necessary, follow the instructions in the setup program.
    Syntax

    NETWORKDAYS(start_date,end_date,holidays)

    Important Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

    Start_date is a date that represents the start date.

    End_date is a date that represents the end date.

    Holidays is an optional range of one or more dates to exclude from the working calendar, such as state and federal holidays and floating holidays. The list can be either a range of cells that contains the dates or an array constant of the serial numbers that represent the dates.

    Remarks

    Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
    If any argument is not a valid date, NETWORKDAYS returns the #VALUE! error value.

  3. #3
    Join Date
    25th May 2004
    Location
    central Europe
    Posts
    773

    Re: Subtract Weekdays From Set Date

    WORKDAYS function will do it. It calculates starting from a given date plu/minus number of workdays.
    In formulae, depending on your locale, you might have to replace ; with , or vice versa.

  4. #4
    Join Date
    11th July 2003
    Location
    Cambridge, UK
    Posts
    40

    Re: Subtract Weekdays From Set Date

    The exact name of the function is =WORKDAY

    =WORKDAY(start_date,days,[holidays])

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  5. #5
    Join Date
    18th December 2007
    Posts
    5

    Re: Subtract Weekdays From Set Date

    Thanks for that. WORKDAY is just what I needed, my schedule is now working a treat.

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