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Overlapping Dates Question

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  • Overlapping Dates Question

    I have a start date and an end date field to record an event, if I enter another event that overlaps a already entered event I would like a message to appear advising me that there is a clash of dates, or indeed something that would prevent the second event from being accepted, or both.

    Example :
    Event 1 - Start Date 14-09-2010 , End Date 20-09-2010
    then I enter
    Event 2 - Start Date 18-09-2010 , End Date 28-09-2010

    Dates overlap and event 2 is not possible.

    However I work with several units, each with their own ID No. and have to ensure that I am checking the dates against the chooen ID. No. as the second event may not clash with another unit and therefore be accepted.

    Any help with this would be appreciated


  • #2
    Re: Overlapping Dates Question

    Does each event have a unit specified? if so, check for the unit and then check to see if the start date of event2 is between start and end of event 1.

    Pseudo code:
    if(event1.unit = event2.unit .and. between(event2.start,event1.start, event1.end),"Display a message and get out","continue")


    • #3
      Re: Overlapping Dates Question

      Hi Tom

      Many thanks for your reply, I have attached a jpeg which may show what I am trying to achieve better than my question did.


      • #4
        Re: Overlapping Dates Question

        I have attached a jpeg of the set structure showing how the dates are linked, hopefully this will give you all a better idea of the direction I should take to reach my objective.

        Many Thanks


        • #5
          Re: Overlapping Dates Question


          I'm not trying to be critical, but that set seems quite large.

          I'll go out on a limb here, and presume you are trying to NOT rent out the same villa to 2 separate parties at the same time.

          You want to notify the renter(?) when they enter a start and end date that the villa is already rented for that period? I would think you would need to check through all the "booked" records for the specific villa and test that the start date isn't between the already booked start and end dates. This is not a big deal with x-basic, as long as each "booked" reservation is a separate record, but I don't know your level of knowlege with x-basic. It could be placed into an "on_depart" event of the form where the info is being entered.

          Is HOLIDAYDATES the table where you are keeping the start and end dates? If so, how do you determine from that table what villa you are looking at? I would recommend putting the villa-id into that table so you can easily check for the netered dates.
          Last edited by Tom Henkel; 09-14-2010, 07:27 PM. Reason: looked a little deeper


          • #6
            Re: Overlapping Dates Question

            The set is rather large but it has been running with no problems for quite a while now and I do not have the knowlege to attempt breaking it down, also I am not up on x-basic enough to write a script for my needs so I guess I will have to make do with doing a manual check on the dates from the attached report.

            Again many thanks for your help.