Hi all  Im trying to add a sensor to my HA that that shows how many days its been since my irrigation has watered a zone on my frontend. I want to monitor the switches for each zone so when it was on last.  I created this template    - platform: template     sensors:       last_greenhouse_watering:         entity_id: switch.greenhouse # Entity to monitor for changes         friendly_name: "Last Greenhouse Watering"         value_template: "{{as_timestamp(states.switch.greenhouse.last_changed) | ...