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Easiest way to perform date subtraction

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  • Easiest way to perform date subtraction

    I have a field called hire_date and it is a date field. I want the system date to subtract the hire date and see if it is equal to or greater than 25 years. I can't find a simple way to do this in the help files.

  • #2
    Re: Easiest way to perform date subtraction

    Look up the AGE() function in the help file.

    = 25
    Tom Baker


    • #3
      Re: Easiest way to perform date subtraction


      As you can see from my previos posts that I am not very strong with the yet. I looked up the age field but don't understand what it wants me to do. I looked at your code and I'm also lost. Here is what I have. One Date field named "Date_Of_Hire" what I want to do is have "Date()" subtract the "Date_Of_Hire" and see if it is greater than or equal to 25 years. You lost me with the 10/08/84 in there.


      • #4
        Re: Easiest way to perform date subtraction

        I suggest you look up "age()" in the Help system as it gives a very good explanation.


        • #5
          Re: Easiest way to perform date subtraction

          Originally posted by Garry Flanigan View Post
          I suggest you look up "age()" in the Help system as it gives a very good explanation.

          Here is what I did. Calculated field Years_Worked = AGE( Hire_Date,date())

          It keeps returning a T if I don't enter anything in the Date_Hired field and a F if I enter something in the Date_Hired field. What am I missing (besides the boat)?


          • #6
            Re: Easiest way to perform date subtraction

            I just don't understand why it is returning a logic answer. My numeric field is 2 in length.


            • #7
              Re: Easiest way to perform date subtraction

              You are clearly doing something wrong, because this is as straight forward as it gets. The setup should be this:
              1) hire_date field date type
              2) age field numeric type set to field rule: calculated: expression as: age(hire_date,date())

              That's it.
              Mike W
              "I rebel in at least small things to express to the world that I have not completely surrendered"


              • #8
                Re: Easiest way to perform date subtraction

                If you have placed this
                Years_Worked = AGE( Hire_Date,date())
                in the expression for your calculated field then you haven't missed the boat, you are comparing one boat to another. :) You are asking if Years_Worked is equal to AGE( Hire_Date,date()). Which results in a yes or no.

                Since you want to assign the value of AGE( Hire_Date,date()) to a field which I assume is Years_Worked you just need to use
                AGE( Hire_Date,date())
                asthe expression.
                Tim Kiebert
                Eagle Creek Citrus
                A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


                • #9
                  Re: Easiest way to perform date subtraction

                  I have this, but any hire_date before the year 2000 comes out with a little square box. Anything 2000 and over hire_date comes out ok. Why no correct calculation before the year 2000?


                  • #10
                    Re: Easiest way to perform date subtraction

                    Sounds like "Years worked" field on your form not set up in line with the underlying table structure.
                    Easiest solution is delete the field from the form and put it back again by dragging it from the toolbox.


                    • #11
                      Re: Easiest way to perform date subtraction


                      Thank you. I don't know why it did this. I did what you said, Deleted it and dragged it back on and it works perfectly.

                      Thanks again.



                      • #12
                        Re: Easiest way to perform date subtraction

                        Hi Scott,

                        While deleting, and dragging the field on again fixed the little square problem, I think you should understand for the future and anyone else reading this thread why you got the the little box instead of a number.

                        Very simply, when you placed the field on the layout you only allowed the length to display of 1 (T or F). The calculated field now needed to display 2 numbers but couldn't, so it showed the little box.

                        You can test this for yourself, open the Invoice in AlphaSports in design mode, change the Invoice Total Display Format from 10 to 2 save and view.
                        Last edited by Keith Hubert; 10-09-2009, 01:08 AM.
                        Keith Hubert
                        Alpha Guild Member
                        KHDB Management Systems
                        Skype = keith.hubert

                        For your day-to-day Needs, you Need an Alpha Database!


                        • #13
                          Re: Easiest way to perform date subtraction

                          I think you should understand for the future and anyone else reading this thread why you got the the little box instead of a number.
                          In the FAQ.
                          There can be only one.