Hour format must be specified in timeline configuration object with x_date property. Here is the example:
scheduler.createTimelineView({
name: "timeline",
x_unit: "hour",
x_date: "%h:%i %A",
x_step: 1,
x_size: 24,
y_unit: [
{key:1, label:"James Smith"},
{key:2, label:"John Williams"},
{key:3, label:"David Miller"},
{key:4, label:"Linda Brown"}
],
y_property: "section_id",
render:"bar"
});