Where can I create macros for templates?

Configuration
22

Macros cannot be used across your system. They are only available in your single template.

You can approach this differently to remove the macro as well, with a template sensor, and yaml anchor.

template:
- trigger:
  - platform: time
    at: "00:00"
    variables: &date_variables
      entities:
      - sensor.cal_karfreitag
      - sensor.cal_valentine_s_day
      dates: >
        {% set ns = namespace(items=[]) %}
        {% for entity in entities %}
          {% set dt = state_attr(entity, 'date') | as_datetime %}
          {% set day =  ['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sonntag'][dt.weekday()] %}
          {% set day = day ~ ', ' ~ dt .strftime('%d.%m.%Y') %}
          {% set ns.items = ns.items + [ (entity, day) ] %}
        {% endfor %}
        {{ dict.from_keys(ns.items) }}
  - platform: homeassistant
    event: start
    variables: *date_variables
  sensor:
  - name: Holidays
    unique_id: holidays
    state: "{{ dates | count }}"
    attributes:
      dates: "{{ dates }}"

Your template in the card would be (it wouldn’t change for any of them).

  - entity: sensor.cal_valentine_s_day
    type: custom:secondaryinfo-entity-row
    secondary_info: "{{ state_attr('sensor.holidays', 'dates')[entity] }}"

EDIT: I’m just going to delete option 1.

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