Need help to understand how to only plot a subset of dates in the SAS dataset. Existing code that plots all dates is listed below.

ods graphics / reset width=6.4in height=4.8in imagemap;

proc sort data=WORK.IMPORT out=_SeriesPlotTaskData;

by observation_date;

run;

proc sgplot data=_SeriesPlotTaskData;

series x=observation_date y=UNRATE /;

xaxis grid label="Date";

yaxis grid label="% Unemployment";

run;

ods graphics / reset;

proc datasets library=WORK noprint;

delete _SeriesPlotTaskData;

run;