Merge cell base on Start and ENd date.

Hi, lets say my date is arrange in Horizontal from Column D onward. Column A, B and C is Start Date, End date and Task. Is it possible that i put the start day and end day and task (example 05/01/2017 09/01/2017 Installing). Then the date will merge and with the word Installing inside. Somethg like the attached file.

To Sheet1 code module

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