Enter your task names in one column
Enter the start dates in the next column
Enter the durations in the next column
Select the task, start date, and duration data
Insert a stacked bar chart
Format the start date series to have no fill
Reverse the order of the task axis if needed
Adjust the date axis scale and bounds
Format the duration bars with your preferred color
Remove chart legend, gridlines, or other unwanted elements
Add titles and labels if desired