De or het kalendermethode?

The correct Dutch article is:

de kalendermethode

Rule Words ending in -ode: always de. See the rule

How to use kalendermethode

the kalendermethodede kalendermethode
this kalendermethodedeze kalendermethode
that kalendermethodedie kalendermethode
our kalendermethodeonze kalendermethode
your kalendermethodejouw kalendermethode
every kalendermethodeelke kalendermethode
which kalendermethode?welke kalendermethode?
a big kalendermethode / the big kalendermethodeeen grote kalendermethode, de grote kalendermethode