Good morning fellow Sharepointers !

I have a big question in my head :

What i did :

I have created a custom Content Type -called Actions -, child of Task content type. SO it herits from Task's columns. I have created a new Task List and added my Actions CT.

So this Actions CT uses new dates columns (like "initial deadline" or "rescheduled deadline") and no more "Beginning", nor "deadline" columns.

Everything is well, i've sat up my views like "late actions","incoming actions" etc...

What is my problem :

BUT when i want to add a new Action to my Timeline, Sharepoint yell at me to verify if my action do have dates !

What i found :

By doing some tests, i have found that perhaps the problem is that Timeline does refer to "Deadline" column to create a marker, and to "Start" and "Deadline" column to define a range of time.

What i would definitely like to do :

I would like to use actions created into this task list in my timeline, so how could i achieve that ? Where could i define that Timeline uses my own custom dates columns instead of standard sharepoint ones ?

The other solution i've found should be to edit the existing columns, but it would modify it for ever. i would like to keep them clean if we ever need them...

--- EDIT ---

After @HarryB commented that this solution should be the one, i've tested it :

  1. Creating a new Site's Content Type, inherinted from Tasks content type
  2. Call it "test Actions"
  3. Click on "Deadline" (in french "Échéance"), to modify its label. test action content type
  4. Get the Column informations, and the only ones i am able to modify for that specific content type : columns information
  5. After clicking on "Edit columns properties", I can finally edit the label and every property of that date column. you can see here that the "Existing groupe" is the "Tasks and main problems columns". column properties
  6. After the warning pop-up, i'm going to see the default task list existing on my SP, that i never add any custom Content types. And.... the default column renamed everywhere

The default columns has been relabeled everywhere. So this appears to be a wrong solution. Thanks to @HarryB though, he gave me some time and reflexion!

---Edit's end ---

I don't know if i'm clear on this, so don't be afraid to tell me an ask for some more information.

Thanks a lot to help me and have a nice day !

  • I recommend that you use the original date columns that are used in the Task content type by renaming them to your desired names.
    – HarryB
    Oct 17, 2016 at 13:50
  • you can rename the columns in your custom content type only rather than the task CT. Also renaming the columns doesnt change the internal names.
    – HarryB
    Oct 17, 2016 at 14:13
  • Thans @HarryB, I've tested this solution and well, it does not work as i would like to. Please see the edit of my question.
    – Gaelle
    Oct 17, 2016 at 14:47
  • To rename a column - make sure you click on the column name listed in the list settings page rather than by going into the content type and accessing the column from there
    – HarryB
    Oct 20, 2016 at 12:06

1 Answer 1


This is what I have tested and it works for me:

  1. Create a new content type inheriting from Task CT
  2. Create a new Out of the box Task list and add my custom Task CT to that list
  3. Make it the default content type
  4. Go to list settings and click on the due date column and rename that to Deadline.
  5. I can add tasks to the timeline
  6. My Due date column in the custom Task CT was not affected by the rename- the name change is only limited to the list

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