# 1752 was a short year on the British calendar!
nulldata 355
# give a negative year to indicate Julian date
ed0 = epochday(-1752,1,1)
# consistent series of epoch day values
series ed = ed0 + index - 1
# Julian dates as YYYYMMDD
series jdate = juldate(ed)
# Gregorian dates as YYYYMMDD
series gdate = isodate(ed)
# Historical: cut-over in September
series hcal = ed > epochday(-1752,9,2) ? gdate : jdate
# And let's take a look
print ed jdate gdate hcal -o