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Round hours to 15 minutes

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  • Round hours to 15 minutes

    I know I've seen this someplace, but can't find it.

    I'm working with time and want to convert hours to round to the nearest 15 minutes

    8.05 hours -> 8.00 hours
    8.20 hours -> 8.25 hours
    8.40 Hours -> 8.50 hours
    8.80 hours -> 8.75 hours
    etc.

    Thanks ~ Tom

  • #2
    Re: Round hours to 15 minutes

    I remember it too, will research.

    This seems pertinent to get you started.

    http://www.alphasoftware.com/alphafo...t=quarter+hour
    There can be only one.

    Comment


    • #3
      Re: Round hours to 15 minutes

      This is even more complicated than I thought.

      Hours is N,5,2
      So I need to separate the integer from the decimal.
      Then see if the decimal is between .125 below or above .25 to determine if it should round to .25 (quarter hour).
      I got .125 by dividing 7.5 minutes / 60.
      Am I on the right track?

      ~ Tom

      Comment


      • #4
        Re: Round hours to 15 minutes

        Tom,

        I have to disagree with you. You're not dealing with time that I can see. Purely numeric calculation.

        Search the desktop area for Numeric Rounding for a helpful thread. August of 2009 is the one I found.
        There can be only one.

        Comment


        • #5
          Re: Round hours to 15 minutes

          Code:
          ?round_fraction(8.05,.25)
          = 8
          ?round_fraction(8.2,.25)
          = 8.25
          ?round_fraction(8.4,.25)
          = 8.5
          ?round_fraction(8.8,.25)
          = 8.75

          Comment


          • #6
            Re: Round hours to 15 minutes

            Hi Gab,

            I don't have a function called "Round_Fraction".
            I do have a "round_up" but it rounds up to the next integer.

            Round_up(8.10,.25) = 9.00 It should be 8.25

            Where can I find the Round_Fraction function?

            ~ Tom

            Comment


            • #7
              Re: Round hours to 15 minutes

              Hi Tom,

              Try this xbasic code as an example:

              dim ttime as c
              ttime="8.80"

              dim tleft as c
              tleft=extract_string(alltrim(ttime),"",".")

              dim tright as c
              tright=right(alltrim(ttime),2)

              if val(tright)>=0 .and. val(tright)<=14
              tright="00"
              else if val(tright)>=15 .and. val(tright)<=29
              tright="25"
              else if val(tright)>=30 .and. val(tright)<=44
              tright="50"
              else if val(tright)>=45
              tright="75"
              end if

              ?tleft+"."+tright
              Gary S. Traub, Ph.D.

              Comment


              • #8
                Re: Round hours to 15 minutes

                Originally posted by Tom Patten View Post
                Hi Gab,
                I don't have a function called "Round_Fraction".
                ~ Tom
                I posted this function and other modifications thereof long time ago in response to a related thread.
                This function allows you to round to any fraction.
                Here is the function:
                Code:
                FUNCTION round_fraction AS N (base AS N, rounding_fraction AS N )
                	dif=mod(base,rounding_fraction)
                	mid=rounding_fraction/2
                	if dif>=mid
                	round_fraction=base-dif+rounding_fraction
                	else
                	round_fraction=base-dif
                	end if	
                END FUNCTION

                Comment


                • #9
                  Re: Round hours to 15 minutes

                  This was in the thread I referenced, haven't tested extensively.

                  round(x*4,0)/4
                  There can be only one.

                  Comment


                  • #10
                    Re: Round hours to 15 minutes

                    THAT's IT!!! EXCELLENT!! PERFECT

                    Thank You Gabe. And thank you all who gave this some thought.

                    ~ Tom

                    Comment


                    • #11
                      Re: Round hours to 15 minutes

                      Stan - Your solution looks even simpler. And of course, it WORKS!! I'll play with the two of them.

                      Thank You Very Much.

                      ~ Tom

                      Comment


                      • #12
                        Re: Round hours to 15 minutes

                        I'm taking no credit or blame. Just remembered there was such a thread.

                        Glad you have choices.
                        There can be only one.

                        Comment


                        • #13
                          Re: Round hours to 15 minutes

                          I do remember that expression as well. It might have been Steve Andrews's. At any rate, I also do remember modifying it into a function in order to accept any fraction, not just a quarter.
                          Here is the function:
                          Code:
                          FUNCTION round_frctn AS N (base AS N, fraction AS N )
                          	round_frctn=round(base*1/fraction,0)*fraction
                          END FUNCTION

                          Comment


                          • #14
                            Re: Round hours to 15 minutes

                            Not to be a killjoy but if this is related to payroll time you might want to check with your state as to where the cutoff is for what fraction constitutes rounding up or down. Here in CA it is .08 hours goes to .25
                            Robin

                            Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

                            Comment


                            • #15
                              Re: Round hours to 15 minutes

                              Originally posted by MoGrace View Post
                              Not to be a killjoy but if this is related to payroll time you might want to check with your state as to where the cutoff is for what fraction constitutes rounding up or down. Here in CA it is .08 hours goes to .25
                              Robin-
                              Can you expound on this please? I have been doing payroll for years in California and have never heard nor found reference to this rounding rule. After reading your comment, I dug some more into it and still can find nothing.
                              What I did find was a CA Supreme Court ruling saying that federal law should be applied, and that rounding punch-in and -out times was acceptable. Referencing 08, the mention was that a punch out time of 5:08 was to be rounded to 5:15 in a quarter-hour rounding basis.
                              Thanks!

                              Comment

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