DST

dst:
  friendly_name: Daylight Savings Times
  unique_id: f2a8791bf12449c4a67d149c609c21c4
  device_class: timestamp
  value_template: >-
    {%- set ns = namespace(spring = none, fall = none) %}
    {%- set today = strptime(states('sensor.date'), '%Y-%m-%d') %}
    {%- for i in range(365) if (today + timedelta(days = i)).timetuple().tm_mon in [3, 10] and (today + timedelta(days = i)) | as_timestamp | timestamp_custom("%w") | int == 0 %}
      {%- set day = (today + timedelta(days = i)).astimezone() %}
      {%- if day.timetuple().tm_mon == 3 %}
        {%- set ns.spring = day.replace(hour = 2) %}
      {%- else %}
        {%- set ns.fall = day.replace(hour = 3) %}
      {%- endif %}
    {%- endfor %}
    {{ [ns.spring, ns.fall] | min }}
  attribute_templates:
    next_spring: >-
      {%- set ns = namespace(spring = none) %}
      {%- set today = strptime(states('sensor.date'), '%Y-%m-%d') %}
      {%- for i in range(365) if (today + timedelta(days = i)).timetuple().tm_mon == 3 and (today + timedelta(days = i)) | as_timestamp | timestamp_custom("%w") | int == 0 %}
        {%- set ns.spring = (today + timedelta(days = i)).astimezone().replace(hour = 2) %}
      {%- endfor %}
      {{ ns.spring }}
    next_fall: >-
      {%- set ns = namespace(fall = none) %}
      {%- set today = strptime(states('sensor.date'), '%Y-%m-%d') %}
      {%- for i in range(365) if (today + timedelta(days = i)).timetuple().tm_mon == 10 and (today + timedelta(days = i)) | as_timestamp | timestamp_custom("%w") | int == 0 %}
        {%- set ns.fall = (today + timedelta(days = i)).astimezone().replace(hour = 3) %}
      {%- endfor %}
      {{ ns.fall }}
    is_dst: >-
      {{ now().timetuple().tm_isdst == 1 }}
    dst_change_tomorrow: >-
      {{ now().astimezone().tzinfo != (now() + timedelta(days = 1)).astimezone().tzinfo }}
    days_to_event: "{{ ((strptime(states('sensor.dst'), '%Y-%m-%d') | as_timestamp - strptime(states('sensor.date'), '%Y-%m-%d') | as_timestamp) / 86400) | int }}"
    phrase: "{{ 'lose' if states('sensor.dst') == state_attr('sensor.dst', 'next_spring') else 'gain' }} an hour"