Templating Help - Defaults

Configuration
2

You don’t need to use timestamp at all…

template:
  binary_sensor:
    state: >
      {% set event = state_attr('calendar.general_bin', 'start_time') | as_datetime | as_local %}
      {% set delta = event - now() %}
      {{ iif(timedelta(hours=8) < delta or delta <= timedelta(), 'off', 'on') }}
    availability: >  
      {{ state_attr('calendar.general_bin', 'start_time') is not none }}

If you want to continue using as_timestamp:

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