Recode certain dates as missing

 

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DATA LIST LIST /date1(ADATE12).
BEGIN DATA
12-28-1959
12-01-1958
12-23-1959
01-01-1960
12-31-1959
12-27-1959
12-22-1959
END DATA.
LIST.

COMPUTE date2=date1.
FORMATS date1 date2 (ADATE12).
* Next lines recodes dates between 23 DEC 1959 and 31 DEC 1959 as missing. 
IF (date1>=DATE.DMY(23,12,1959) & date1<DATE.DMY(1,1,1960)) date2=$SYSMIS.
EXECUTE.
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