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Calculate number of months

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  • Calculate number of months

    Date2 - Date1 = number of days

    How do I convert number of days to number of months?

    e.g.
    num_months/30?
    num_months/31?
    num_months/30.x?

    In this case a monthly payment needs to be made.


    If 60 days have passed, do I make 2 payments or 1 payment?
    Peter
    AlphaBase Solutions, LLC

    Peter@AlphaBaseSolutions.com
    https://www.alphabasesolutions.com



  • #2
    Re: Calculate number of months

    I guess this works for me:

    Code:
    vMonthDiff = Month(End_Date) - Month(Start_Date)
    
    IF substr(CDATE(End_Date),7,2) > substr(CDATE(Start_Date),7,2)
    	vMonths = vMonthDiff
    Else
    	vMonths = vMonthDiff - 1
    End if
    Peter
    AlphaBase Solutions, LLC

    Peter@AlphaBaseSolutions.com
    https://www.alphabasesolutions.com


    Comment


    • #3
      Re: Calculate number of months

      Okay, haste makes waste. This one takes into account two dates like:

      Code:
      Start_Date = {12/17/2015}
      End_Date = {1/17/2015}
      
      vMonthStart = Month(Start_Date)
      vMonthEnd = Month(End_Date)
      
      If vMonthEnd < vMonthStart
      	vMonthEnd = vMonthEnd + 12
      End if
      
      vMonthDiff = vMonthEnd - vMonthStart
      
      Select 
      	Case vMonthDiff = 1 .AND. substr(CDATE(End_Date),7,2) = substr(CDATE(Start_Date),7,2)
      		vMonths = vMonthDiff
      	
      	Case substr(CDATE(End_Date),7,2) > substr(CDATE(Start_Date),7,2)
      		vMonths = vMonthDiff
      	
      	Case ELSE
      		vMonths = vMonthDiff - 1
      End Select
      Peter
      AlphaBase Solutions, LLC

      Peter@AlphaBaseSolutions.com
      https://www.alphabasesolutions.com


      Comment


      • #4
        Re: Calculate number of months

        I didn't study your effort very closely. Does it handle months in different years?
        There can be only one.

        Comment


        • #5
          Re: Calculate number of months

          My last post does. Thanks

          Actually it only handles one yer diff, but it would never ever go to two years so that works.
          Peter
          AlphaBase Solutions, LLC

          Peter@AlphaBaseSolutions.com
          https://www.alphabasesolutions.com


          Comment


          • #6
            Re: Calculate number of months

            peter
            you might need to consider year, month and day before month difference is calculated.
            see if this function is any use
            Code:
            FUNCTION monthDifference AS N (date1 AS D, date2 AS D )
            	dim d1 as n
            	dim d2 as n
            	
            	dim m1 as n
            	dim m2 as n
            	
            	dim y1 as n
            	dim y2 as n
            
            	d1 = day(date1)
            	d2 = day(date2)
            	m1 = month(date1)
            	m2 = month(date2)
            	y1 = year(date1)
            	y2 = year(date2)
            
            	monthDifference= ((y2-y1)*12) + (m2-m1) + (if (d2>d1,0,-1))
            END FUNCTION
            thanks for reading

            gandhi

            version 11 3381 - 4096
            mysql backend
            http://www.alphawebprogramming.blogspot.com
            ggandhi344@gmail.com
            Skype:ggandhi344@gmail.com
            1 914 924 5171

            Comment


            • #7
              Re: Calculate number of months

              That's a nice little function.

              But if I put in 6/11/2016 & 8/11/2016 it gives me 1, not 2, which is what I need in my case.
              Peter
              AlphaBase Solutions, LLC

              Peter@AlphaBaseSolutions.com
              https://www.alphabasesolutions.com


              Comment


              • #8
                Re: Calculate number of months

                monthDifference= ((y2-y1)*12) + (m2-m1) + (if (d2>d1,0,-1))
                if you change this line to
                monthDifference= ((y2-y1)*12) + (m2-m1) + (if (d2>=d1,0,-1))
                it should work

                ?monthDifference({06/11/2016},{08/11/2016})
                = 2
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                ggandhi344@gmail.com
                Skype:ggandhi344@gmail.com
                1 914 924 5171

                Comment


                • #9
                  Re: Calculate number of months

                  http://www.alphasoftware.com/alphafo...-in-date-range
                  There can be only one.

                  Comment


                  • #10
                    Re: Calculate number of months

                    Originally posted by Peter.Greulich View Post
                    Okay, haste makes waste. This one takes into account two dates like:

                    Code:
                    Start_Date = {12/17/2015}
                    End_Date = {1/17/2015}
                    ??
                    Now you are talking about real haste!
                    Perhaps you meant:
                    Start_Date = {12/17/2015}
                    End_Date = {1/17/2016}
                    At any rate, I remember a similar question in the past and remember posting a function to do that.
                    Might not be exactly what you want, depending on what you want:
                    How do you want to calculate a fraction of the month?
                    Just consider it a month?

                    Comment


                    • #11
                      Re: Calculate number of months

                      Perhaps you meant:
                      Start_Date = {12/17/2015}
                      End_Date = {1/17/2016}
                      Exactly!
                      Peter
                      AlphaBase Solutions, LLC

                      Peter@AlphaBaseSolutions.com
                      https://www.alphabasesolutions.com


                      Comment


                      • #12
                        Re: Calculate number of months

                        30.4375 is the avg number of days in a month
                        365.25 / 12

                        The number of days to first payment has to be worked out for the interest to be correctd. So a 6 moth loan based on x apr and 45 days to first?
                        Dave Mason
                        dave@aldadesktop.com
                        Skype is dave.mason46

                        Comment

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