Left: Move to the previous day.
Right: Move to the next day.
Up: Move to the previous week.
Down: Move to the next week.
PgUp: Move to the previous month.
PgDn: Move to the next month.
Home: Move to the previous year.
End: Move to the next year.
Enter: Select start and end date. By selecting the end date the calendar will be closed.
Esc/Tab: Close the calendar.
