Configure date time format of a sensor to display as day and time

Configuration
1

I’m trying to configure a sensor created from an attribute of a binary sensor to display the date time in a readable format (day of the week and time in 24h format). I am wanting to change the onset and expires sensors.

Currently I have this as my template:

sensor: 
  - platform: template
    sensors:
            meteoalarm_onset:
                friendly_name: "Meteoalarm - Alert Onset"
                value_template: "{{as_timestamp(state_attr('binary_sensor.meteoalarm', 'Onset')) | timestamp_custom('%A %x %X') }}"
            meteoalarm_certainty:
                friendly_name: "Meteoalarm - Alert Certainty"
                value_template: "{{ state_attr('binary_sensor.meteoalarm', 'certainty' ) }}"
            meteoalarm_expires:
                friendly_name: "Meteoalarm - Alert Expires"
                value_template: "{{ state_attr('binary_sensor.meteoalarm', 'expires' ) }}"
            meteoalarm_headline:
                friendly_name: "Meteoalarm - Alert Headline"
                value_template: "{{ state_attr('binary_sensor.meteoalarm', 'headline' ) }}"
            meteoalarm_description:
                friendly_name: "Meteoalarm - Alert Discription"
                value_template: "{{ state_attr('binary_sensor.meteoalarm', 'Description' ) }}"
            meteoalarm_instruction:
                friendly_name: "Meteoalarm - Alert Instruction"
                value_template: "{{ state_attr('binary_sensor.meteoalarm', 'Instruction' ) }}"

and the sensor is showing as unavailable. The sensor before trying to format shows as:
image

Log error:

TemplateError('ValueError: Template error: as_timestamp got invalid input 'None' when rendering template '{{as_timestamp(state_attr('binary_sensor.meteoalarm', 'Onset')) | timestamp_custom('%A %x %X') }}' but no default was specified') while processing template 'Template<template=({{as_timestamp(state_attr('binary_sensor.meteoalarm', 'Onset')) | timestamp_custom('%A %x %X') }}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.meteoalarm_onset'

As a side point, I’d also like to display the description and instruction attributes as well as currently they only show up as unavailable.

Any ideas?

2

My guess is that your error is the capitalization of Onset, Description, and Instruction. Try making them all lower case and see if that resolves your issue.

3

That worked for onset, thank you!
image

Unfortunately, I get this for description and instruction now:

image
image1521×387 13.3 KB

where they no longer follow the name they were assigned. I found capitalizing resolved that issue initially hence why they were capitalized but clearly onset shouldn’t have been.