I have to set a certain temperature on day 1 (specific date) and then different temp on day 2. This is sent to a servo which controls the heating apparatus.
By far the below is what you are looking
Where I am going with this, is that Node RED is full of extensions, that facilitate your wildest dreams!
My suggestion is to start with node-red-contrib-cron-plus, and then take it from there, like setting schedules from a UI plugin - But first use it without a UI - so you get a feel of how to use Node RED.
If you have not already done so then watch this playlist: Node-RED Essentials. The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot in about 1 hour. A small investment for a lot of gain.