Templating Help

Configuration
3

So, here’s what I would use. Works even during leap years. Gotta use the time_date platform to get a sensor that updates once a day. Using this will create sensor.date.

sensor:
  - platform: time_date
    display_options:
      - 'date'
    
  - platform: template
    sensors:
      remaining_days:
        entity_id:
          - sensor.date
        value_template: >
          {% set this = now().replace(hour=0).replace(minute=0).replace(second=0).replace(microsecond=0) %}
          {% set next = this.month + 1 if this.month + 1 <= 12 else 1 %}
          {% set last = this.replace(month=next, day=1) %}
          {{ (last.date() - this.date()).days }}
  - platform: template
    sensors:
      past_days:
        entity_id:
          - sensor.date
        value_template: >
          {% set this = now().replace(hour=0).replace(minute=0).replace(second=0).replace(microsecond=0) %}
          {% set next = this.month + 1 if this.month + 1 <= 12 else 1 %}
          {% set first = this.replace(day=1) %}
          {{ (this.date() - first.date()).days }}
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