The PDJULGw.
format writes SAS date values in the form yyyydddF:
yyyy
is the two-byte representation
of the four-digit Gregorian year.
ddd
is the one-and-a-half
byte representation of the three-digit integer that corresponds to
the Julian day of the year, 1–365 (or 1–366 for leap
years).
F
is the half byte that
contains all binary 1s, which assigns the value as positive.
Note: SAS
interprets a two-digit year as belonging to the 100-year span that
is defined by the YEARCUTOFF= system option.