To do the following:

Press:

Move to the current day (daily view)

Move to the current month (monthly view)

Move to the current week (weekly view)

CTRL+HOME

Move to the next / previous row (weekly and monthly view)

Move to the next / previous time increment (daily and work week view)

Down Arrow / Up Arrow

Move to the previous / next column (weekly view)

Move to the previous / next day (daily and monthly views)

Move to the previous / next workday (work week view)

Left Arrow / Right Arrow

Select a duration for a scheduled activity

SHIFT+Down Arrow /  SHIFT+Up Arrow

View the Mini-calendar

F4

View the next day (daily view)

View the next month (monthly view)

View the next week (weekly view)

Page Down

View the previous day (daily view)

View the previous month (monthly view)

View the previous week (weekly view)

Page Up

View the daily calendar

SHIFT+F5

View the monthly calendar

F5

View the weekly calendar

F3

View the work week calendar

SHIFT+F3