1. A concise explanation of the problem you're experiencing.
The timeline at the bottom seems not to work with the provided start time and stop time.
Regardless of what value I set; it is always set based on the todays day.
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
viewer.clock.startTime = sampledPositions.startTime.clone();
viewer.clock.stopTime = sampledPositions.endTime.clone();
viewer.clock.currentTime = sampledPositions.startTime.clone();
viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP;
However, the time line on the bottom shows March 14 2018.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
Visualize certain date period.
4. The Cesium version you're using, your operating system and browser.