[...] Otherwise, valid dates are in the range
of August 24, 1928, to May 9, 2071.
Now why it can only convert *YYMD from 20710509 into *CYMD 1710509 and not
*YYMD 20710510 into *CYMD 1710510 escapes me.
I think I would avoid this crap and start using 'real' date columns.