Similar to org charts and brainstorming diagrams, you can also create timelines in Visio to depict a schedule or a series of events.
To create a timeline, go to the New menu in the File tab and click Templates. Go to the Schedule category, click Timeline and then Create to create the timeline workspace. Since the timeline essentially measures time, units selection is inconsequential.
Once the Timeline template is created, click and drag the Block timeline shape from the Shapes pane onto the canvas. This opens a Configure Timeline dialog box, where you can select the duration for the timeline and the Timescale. Click Ok.
It creates a timeline block with equal intervals between the selected dates.