When the numbers six, dix, etc. quantify a noun, such as in six minutes, dix bananes, the final s sound disappears.
What about when these numbers indicate dates of a month, such as in six janvier, dix mars, etc.?
There are actually three possible situations, depending mainly on the word following six or dix :
To take in consideration : according to the region of France you live in, liaisons and pronounciation of a final letter are subject to change ; in the south, people are more up to pronounce the final x of six & dix as an s, less in the northern half ; there are even some regions (more in the north-eastern country) where the final t in vingt is being pronounced(but not the g), which always surprises me.