1 – Click on Setup Timeline in the Gantt menu in the Excel Ribbon. 2 – Set the Start Date and the End Date. 3 – Set the column width of each view if you would like to change it. Click the Update Timeline button once done. The timeline will now be redrawn based on the dates.

To make a Gantt chart from an Excel bar chart, we can start with the following simple data: Task, Start Date, End Date, and Duration. Since dates and duration are interrelated, usually Start is entered, and either End or Duration. If Start and Duration are entered, End is calculated as =Start+Duration.