These docs are for an old release.
View the v7 docs
firstHour 1.4
Determines the first hour that will be visible in the scroll pane.
Integer, default: 6
Values must be from 0-23, where 0=midnight, 1=1am, etc.
The user will be able to scroll upwards to see events before this time. If you want to prevent users from doing this, use the minTime option instead.