This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how we can implement hit event on DateAxis labels to automatically zoom to the clicked period.
See the Pen amCharts 4: Zoom to month by clicking on a DateAxis label by amCharts team (@amcharts) on CodePen.24419