Watch this carefully

and understand that it is not German perfection and also never was. It is Autism. 

The printed dates need to match and his laughing means that he has regularly employees sneaking around his premises about to crawl up the walls like spiders not finding matches or worse, a number off or swapped. 

Give him that 

01.01.1980 and 01.11.1980

01.01.1980 and 11.11.1980

01.01.1980 and 01.01.1981 

01.01.1980 and 02.01.1980

01.01.1980 and     .01.1980