De or het documentdatum?

The correct Dutch article is:

het documentdatum

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 documentdatum

the documentdatumhet documentdatum
this documentdatumdit documentdatum
that documentdatumdat documentdatum
our documentdatumons documentdatum
your documentdatumjouw documentdatum
every documentdatumelk documentdatum
which documentdatum?welk documentdatum?
a big documentdatum / the big documentdatumeen groot documentdatum, het grote documentdatum