The vector stencils library "Timelines and milestones" contains 24 shapes of time scales with start and finish dates, time interval bars with progress indication and brackets, milestone, event and today markers for drawing the timeline diagrams using the ConceptDraw PRO diagramming and vector drawing software.
"A timeline is a way of displaying a list of events in chronological order, sometimes described as a project artifact. It is typically a graphic design showing a long bar labelled with dates alongside itself and (usually) events labelled on points where they would have happened. ...
Another type of timeline is used for project management. In these cases, timelines are used to help team members to know what milestones need to be achieved and under what time schedule. For example, in the case of establishing a project timeline in the implementation phase of the life cycle of a computer system." [Timeline. Wikipedia]
The example "Design elements - Timelines solution" is included in the Timeline Diagrams solution from the Management area of ConceptDraw Solution Park.