SAS - get a maximum and corresponding ID variable for the maximum value

sas_proc_summary_maxid_minid.sas

/* Find a maximum value and the date that maximum value occurred
Using PROC SUMMARY to get the ID variables of statistics using MAXID and MINID statistics.
Tags: MinID, MaxID, PROC SUMMARY
*/

*create sample data;
data have;
input station $ datetime  anydtdtm.      calculatedpower ;
format datetime datetime.;
cards;
ABBA    28AUG2018:0:0:0     100         
ABBA    31AUG2018:12:0:0    88          
ABBA    01SEP2018:1:0:0     1           
ZZZZ    07SEP2018:0:0:0     900         
ZZZZ    09SEP2018:0:0:0     1000        
ZZZZ    21SEP2018:0:0:0     3000        
;;;;
run;

*calculate max/min by group and include the data the max and minimum occurred;
proc summary data=have nway;
class station;
id datetime; *specify the ID variable to be used;
var calculatedPower;
*MINID and MaxID capture the ID variable for the Min/Max values;
output out=summary min=Min_power max=max_power minid=min_date  maxid=max_Date;
run;

*add data back to original table;
data final;
merge have summary;
by station;
run;