Finding the free project dates

Nasir@EBC ✭✭
edited 12/09/19 in Formulas and Functions


I am running a number of tasks in a sheet, with each task having its own Start and Finish date. 

What I need to find out, is a "free" period when there is absolutely no task running. 


Task A is from Jan 1 to 10;

Task B is from Jan 5 to 12;

Task C is from Jan 16 to 20; 

Task D is from Jan 15 to 25; 

and so on....

In the above example, the free period is from Jan 13 to 14 as none of the task-dates falls within this time window! 

Is there any way to find out all such "free" dates --either individually or collectively?


Please help! 



  • Paul Newcome
    Paul Newcome ✭✭✭✭✭✭

    The first thing that comes to mind for me would be to use a date column to replicate each day of the month [Date Check]. Then I would add a checkbox column [Free Date].


    In the checkbox column you could use a formula such as 


    =IF(COUNTIFS([Start Date]:[Start Date], @cell <= [Date Check]@row, [End Date]:[End Date], @cell >= [Date Check]@row) = 0, 1)


    First this will count how many rows have a start/end date that overlaps the date in question. If that count is zero, then no dates overlap making it a free date and checking the box.


    There are a lot of different ways to collect those free dates for display.

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