Stumped by Template Binary Sensor! Looking for guidance

@Zoriontsu wrote:

I have many fairly complex binary sensors working without a hitch, but this on is really aggravating me, as I cannot make it work.
I am trying to create a binary sensor that will turn on if there is a Google Calendar event within 30 minutes.

The following template works perfectly in the Development Tools Template Editor:

`{{ (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) <= 30 and (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) > 0 }}`

But… If used in my binary sensor, the sensor never changes:

  - platform: template
      joint_calendar_event_within_30_minutes:
        friendly_name: 'Joint Calendar Event Within 30 Minutes'
        value_template: "{{ (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) <= 30 and (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) > 0 }}"

I have tried several variations such as:

      joint_calendar_event_within_30_minutes:
        friendly_name: 'Joint Calendar Event Within 30 Minutes'
        value_template: >-
          {{ (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) <= 30 and (((as_timestamp(states.calendar.home.attributes.start_time) - as_timestamp(now())) / 60) | int) > 0 }}

Thanks in advance.

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