-- dig upwards
function default.dig_up(pos, node, digger)
	if digger == nil then return end
	local np = {x = pos.x, y = pos.y + 1, z = pos.z}
	local nn = minetest.get_node(np)
	if nn.name == node.name then
		minetest.node_dig(np, nn, digger)
	end
end

-- Boolean whether it is day (04:48 to 19:19)
function default.is_day()
	local tod = minetest.get_timeofday()
	if tod > 0.2 and tod < 0.805 then
		return true
	end

	return false
end