Home Assistant - Octopus Energy Event

Hi All,

I'm looking to create a flow based on some event data which I get out of my Octopus Energy integration. Every so often, we get cheap electric for a period of time - and I see this information in home assistant - for example, we have one today:


event_types: octopus_energy_all_octoplus_saving_sessions
event_type: octopus_energy_all_octoplus_saving_sessions
- id: 1165
  start: '2023-11-29T17:00:00+00:00'
  end: '2023-11-29T18:30:00+00:00'
  rewarded_octopoints: null
- id: 1166
  start: '2023-12-01T16:30:00+00:00'
  end: '2023-12-01T18:00:00+00:00'
  rewarded_octopoints: null

If we have a 'saving session' on a given day - I want to charge my home battery up 4 hours before - so for example, I would want to start my charge at 12:30 today, as there is a saving session at 16:30 - but I'm struggling with a flow that can pick out the latest date and time out of that dynamic attribute list from the event entity.

I already have the charging flow working - I just need a node that can fire at the right time, dependent on the above - can anyone help with how I go about doing that? I imagine that I'd have to write a function to do this, as I can't see a built-in node to do it with.


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