wildcards with datetime columns

Folks,

how do I use wildcards in 'where' clauses together with datetime columns?

example:
select * from table where datum > 'Fri Dec 14%';

I use '%' as wildcard, but it does not work. What is the correct character
for that?

I get an error messages 'wrong datetime format' something like that. Any
hints?

Regards,  Harald

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