De or het diplomadatum?

The correct Dutch article is:

het diplomadatum

Rule Words ending in -um and -ium: usually het. See the rule

This word is not in the word lists we use to double-check answers.

How to use diplomadatum

the diplomadatumhet diplomadatum
this diplomadatumdit diplomadatum
that diplomadatumdat diplomadatum
our diplomadatumons diplomadatum
your diplomadatumjouw diplomadatum
every diplomadatumelk diplomadatum
which diplomadatum?welk diplomadatum?
a big diplomadatum / the big diplomadatumeen groot diplomadatum, het grote diplomadatum