Timer starting time in just 1 input_number

Configuration
1

Hi,

All the timers that I see have 2 input_numbers (sliders) to set “starting time” (one for hours and another for minutes).
I would like to have it in just one slider.

I’m trying:

configuration.yaml

input_number:
  hora_de_inicio_fraccion:
    name: Hora de inicio
    icon: mdi:timer
    initial: 12
    min: 0.00
    max: 23.75
    step: 0.25

  - platform: template
sensors:
  tiempo_de_depuradora:
    friendly_name: 'Tiempo de depuradora'
    value_template: '{{ states.input_number.hora_de_inicio_fraccion.state | int }}:{% if states.input_number.minutos_riego.state|length == 1%}0{% endif %}{{(((states.input_number.hora_de_inicio_fraccion.state | float) - (states.input_number.hora_de_inicio_fraccion.state| int)) * 60) | int }}'

automation.yaml

- id: 'programador depuradora'
  alias: 'Programa depuradora'
  initial_state: 'true'
  trigger:
    - platform: time_pattern
      minutes: '/1'
      seconds: 10
  condition:
    - condition: template
      value_template: '{{ (now().strftime("%s") | int | timestamp_custom("%H:%M", False)) == states.sensor.tiempo_de_depuradora.state }}'

It is working OK, but
is it possible to see the slider values in HH:MM format insted of HH.hh?
The sensors looks Ok, but the slider appears in fraction of hours.
(18.25 in the slider means 18:15h as seen in the sensor)

Captura

Thanks