Leap Year Detection

The script uses a DATA step to iterate through years from 2000 to 2200. For each year, it attempts to construct a date for February 29th. If the resulting date is not missing (meaning February 29th is a valid date for that year), then the year is considered a leap year and is added to the 'leap_years' output dataset. Only the 'year' variable is kept in the final dataset.

Data Analysis

Type : CREATION_INTERNE

The data is entirely generated internally by the DATA step, without dependency on existing datasets (SASHELP or external).

1 Code Block

DATA STEP Data

Explanation :
This block is a DATA step that creates a new dataset named 'leap_years'. It initializes a 'date' variable to store date values. A 'do' loop iterates through each year from 2000 to 2200. Inside the loop, the MDY() function is used to attempt to create a date for February 29th of the current year. If February 29th is not a valid date (i.e., the year is not a leap year), the MDY() function returns a missing value. The 'if not missing(date)' condition filters these cases, only writing leap years to the output dataset via the 'output' statement. The 'keep=year' option ensures that only the 'year' variable is retained in the final dataset.

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1	DATA leap_years(keep=year);
2	LENGTH date 8;
3	DO year=2000 to 2200;
4	/* MISSING when Feb 29 not a valid date */
5	date=mdy(2,29,year);
6	IF not missing(date) THEN
7	OUTPUT;
8	END;
9	RUN;

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