Adding x-minutes to an alarm datetime dynamically

Configuration
1

Hi!

I have an input_datetime helper for my wake up alarm. Currently I have a hard coded value for the number of seconds to add to the datetime to serve as a grace period for some of my automations. This works well, but I would like the number of added seconds to be dynamic based on the value of an helper instead of being static. I would also like it to be in minutes instead of seconds.

This is the working code I have today (static value 7200):

service: input_datetime.set_datetime
   data:
  time: >-
    {{(((state_attr('input_datetime.alarm' , 'timestamp')) + 7200) |
    timestamp_custom('%H:%M', false))}}
target:
  entity_id: input_datetime.alarmtillegg

I’ve replaced the static number with an new input_number.alarmtilleggstid helper in the template like so:

{{(((state_attr('input_datetime.alarm' , 'timestamp')) + (states('input_number.alarmtilleggstid'))  |
    timestamp_custom('%H:%M', false )))}}

But the template fails:

ValueError: Template error: timestamp_custom got invalid input '6000.0' when rendering template '{{(((state_attr('input_datetime.alarm' , 'timestamp')) + (states('input_number.alarmtilleggstid')) | timestamp_custom('%H:%M', false )))}}' but no default was specified

Would greatly appreciate any help to get futher with this!

2

States are always strings, you need to apply the int or float filter to the state of the Input number.

However, I would suggest avoiding timestamps and just using datetime objects and methods, but the exact way to set that up depends on whether input_datetime.alarm is time-only or date and time:

Date and Time:
{% set current = states('input_datetime.alarm) | as_datetime | as_local%}
{%- set add_min = states('input_number.alarmtilleggstid') | int %}
{{- (current + timedelta(minutes = add_min)).strftime('%H:%M') }}

Time Only:
{% set current = today_at(states('input_datetime.alarm')) %}
{%- set add_min = states('input_number.alarmtilleggstid') | int %}
{{- (current + timedelta(minutes = add_min)).strftime('%H:%M') }}
1 Like
3

Mine is time only. Worked like a charm! Thank you very much!

1 Like