This repository demonstrates adding time zone conversion columns into the gutter of the React Big Calendar component.
The timeGutterHeader and timeSlotWrapper components (the components prop)
are is used to enable this. With timeSlotWrapper, props.resource can be
either undefined or null. undefined identifies a slot belonging to the
calendar gutter, null or any other value identifies a slot belonging to the
calendar time grid. We add the rbc-time-header-gutter class name to our own
custom gutter header so that the automatic stretching to match the gutter width
is carried out by RBC as with the default calendar gutter header.