The plot request plots Calls on the vertical axis and Date on the horizontal
axis. HAXIS= uses a monthly time for the horizontal axis. The notation
'1JAN94'd is a date constant. The value
'1JAN95'd ensures that the axis will
have enough room for observations from December.
proc plot data=emergency_calls;
plot calls*date / haxis='1JAN94'd to '1JAN95'd by month;