Add almond milk, dates, cinnamon, cardamom, ginger, nutmeg, salt and vanilla to a blender, and blend until smooth. Place chia seeds in a medium bowl, and pour over spiced almond milk, stirring to combine. Cover and chill in the fridge for at least 15 minutes (or up to 3 days). Stir 3 times during the first 15 minutes to break up any clumps of chia seeds.