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# obtain two lists - one of dates and one of times
d = grib_get_long(fs, 'validityDate')
t = grib_get_long(fs, 'validityTime')

# times are in hours, like 1200 is 12:00, so we have to divide by 100
# to get them into hours, then by 24 to get them into fractions of days
dates = d + (t / 2400 ) # ASSUME the times are in hours, like 1200 is 12:00
print(dates)

# but these are still numbers - we need to allcall the date() function to convert
# into proper date variables, and we need to loop through the list to do it
date_list = nil
loop dt in dates
    date_list = date_list & [date(dt)]
end loop
print(date_list)