I’m attempting to merge two working simple automations into one because having one automation to switch on a thermostat and a second automation to switch it off lacks elegance and means two automations have to be managed.
I’m attempting to create my first service template which uses a very basic if/else block based on times. The times come from helpers, the values are input from lovelace.
All that has to happen is the generic thermostat is switched on if it’s within the on and off times. Simple, right? Code below. I think I’m probably tangled up in time formats but there may be more. I’ve spent hours reading finity’s EPIC Time Conversion thread and searching. I’ve gone snowblind 
Why is this automation not turning the thermostat on and off?
- id: '1612078816753'
alias: Warm the bed 2
description: description
trigger:
- platform: time
at: input_datetime.underblanket_on
condition: []
action:
- service_template: >
{%- set t_now = now().time() %}
{%- set t_on = strptime(input_datetime.underblanket_on, '%H:%M') %}
{%- set t_off = strptime(input_datetime.underblanket_off, '%H:%M') %}
{% if t_now >= t_on and t_now < t_off %}
climate.turn_on
{% else %}
climate.turn_off
{% endif %}
data: {}
entity_id: climate.underblanketthermostat
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