HA Simple Timer Integration

[vzoliveiraglintt]

Describe the bug
I want to use a timer bar card to show the remaing time of the "HA Simple Timer Integration"

Your card configuration
First example

type: custom:timer-bar-card
entity: sensor.oven_runtime_01k2ya2q
bar_radius: 5px
bar_height: 12px
duration:
  attribute: timer_remaining
  state: true
mushroom: null
grid_options:
  columns: full
  rows: 1

Debug information
this configuration results in "Error: Could not convert duration 3030.0 is not of format 0:10:00. If your are passing a number, specify the units property". setting units to seconds with state false, doesn't help because it starts to show an increasing count from state and not attributes

Your card configuration
Second example

type: custom:timer-bar-card
entity: sensor.oven_runtime_01k2ya2q
duration:
  attribute: timer_finishes_at
bar_radius: 5px
bar_height: 12px
mushroom: null
grid_options:
  columns: full
  rows: 1

Debug information
this configuration results in "Error: Could not convert duration: 2025-08-18T14:17:56.240944+00:00 is not of format 0:10:00. If you are passing in a number, specify the units property."