What does CCYYMMDD date format mean?
It's just another way of writing yyyyMMdd
.
The CC
part represents the century, while YY
is the two-digit year.
It means yyyyMMdd, as in year (4 digits), month (2 digits, leading zero) and day (2 digits, leading zero).
So the ISO 8601 date 2014-01-05
is represented as CCYYMMDD as 20140105
.