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Finding smallest and largest gaps in list of dates.

  1. 02-20-2016, 07:03 AM #1
    ajay1965
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    Finding smallest and largest gaps in list of dates.

    I have a long list of dates (in order, in one column; oldest at the top), about 240, which are entered when an event happens. These might happen twice in one day, or have a gap of several months. What I'd like to be able to do is find the smallest and biggest gap between dates.

    So I'm guessing a means of searching down the list, comparing each with the one before (above) it, and finding the smallest gap in the list (probably 0) and the largest. If it could also be modified to search certain date ranges within the list (e.g. the previous 12 months) that would be excellent, but not vital

    Very grateful for any and all help, this has proven very tricky
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  2. 02-20-2016, 07:04 AM #2
    hemesh
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    Re: Finding smallest and largest gaps in list of dates.

    Attach a sample workbook. Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate. Make sure your desired results are shown, mock them up manually if necessary.

    Remember to desensitize the data.

    Click on GO ADVANCED and use the paperclip icon to open the upload window.

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  3. 02-20-2016, 08:40 AM #3
    ajay1965
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    Re: Finding smallest and largest gaps in list of dates.

    Thanks, I've attached a quick example.

    EDIT: well I thought I had, it shows up in preview post, but not when I posted?
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    Last edited by ajay1965; 02-20-2016 at 08:44 AM.
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  4. 02-20-2016, 08:56 AM #4
    Tony Valko
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    Re: Finding smallest and largest gaps in list of dates.

    In your file you say the longest gap is 24 days.

    However, I believe the correct result is 77 days.

    Cell A111 = 7/28/2013
    Cell A112 = 10/13/2013

    Difference is 77 days.

    Both formulas need to be array entered**.

    For the longest gap:

    =MAX(A2:A119-A1:A118)

    For the shortest gap:

    =MIN(A2:A119-A1:A118)

    ** array formulas need to be entered using the key
    combination of CTRL,SHIFT,ENTER (not just ENTER).
    Hold down both the CTRL key and the SHIFT key
    then hit ENTER.
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  5. 02-20-2016, 11:06 AM #5
    ajay1965
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    Re: Finding smallest and largest gaps in list of dates.

    Thank you very much, that's great. Is there anyway of doing it when you have an ever increasing list, i.e. where you don't know the max list of dates?

    Thanks again
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  6. 02-20-2016, 02:00 PM #6
    shg
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    Re: Finding smallest and largest gaps in list of dates.

    =MAX(A2:INDEX(A:A, MATCH(--"12/31/9999",A:A )) - A1:INDEX(A:A, MATCH(--"12/31/9999",A:A ) - 1))

    Still confirmed with CSE.
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  7. 02-20-2016, 04:04 PM #7
    ajay1965
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    Re: Finding smallest and largest gaps in list of dates.

    That's excellent shg; is there also a way to MATCH from a date, e.g. instead of up to 12/31/9999, but from today()-365 to 12/31/1999? Many thanks.
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