How long has timer been running / elapsed time

Configuration
1

I have this template to calculate the remaining time on a timer:

{% set f = state_attr('timer.living_room_movie_mode_timer', 'finishes_at') %}

{{ '00:00:00' if f == None else 
    (as_datetime(f) - now()).total_seconds() | timestamp_custom('%H:%M:%S', false) }}

What I want is to calculate how much time has passed on the timer. I understand there is a ‘duration’ attribute. I want to subtract the remaining time from the duration, but I’m just not savvy enough to get this to work.

2

Edit: Keep reading this solution does not work as intended.
Okay, I did figure it out:

{% set d = state_attr('timer.living_room_movie_mode_timer','duration') | as_timedelta %}
{% set f = state_attr('timer.living_room_movie_mode_timer', 'finishes_at') | as_datetime %}

{{ '00:00:00' if f == None else 
    (( d.total_seconds() - ( f - now()).total_seconds()))  | timestamp_custom('%H:%M:%S', false) }}
3

NOTE

If the timer is not active it will have no finishes_at attribute therefore the state_attr() function will report None. However the as_datetime filter doesn’t accept the value None so it will result in an error that aborts further processing of the template.

The linked example handles the situation correctly.

4

There does seem to be a problem with my solution that has something to do with the placement of the ’

| as_datetime

when setting the f variable.

When the timer resets or finishes, I get this error

TypeError: float() argument must be a string or a real number, not 'NoneType'

If I set the f | as_datetime in the template itself instead of when defining it in the variable, the ‘if f == None’ is correctly checked, but then the template does not work

TypeError: unsupported operand type(s) for -: 'str' and 'datetime.datetime'

I’m not even sure if I’m explaining this well, but I figure someone who understands this better may be able to figure out the issue.

5

Thanks @123 , we must have been typing at the same time. I’ll check this out. Thanks a lot.

1 Like
6

Final Resolution:

{% set t = 'timer.living_room_movie_mode_timer' %}
{% if is_state(t, 'active') %}
  {% set d = state_attr(t,'duration') | as_timedelta %}
  {% set f = state_attr(t, 'finishes_at') | as_datetime %}
  {{ ( d.total_seconds() - ( f  - now()).total_seconds())  | timestamp_custom('%H:%M:%S', false) }}
{% else %}
  00:00:00
{% endif %}
1 Like