How to create the alarm clock in HASS?

oh, i can fix it, add sensor.time to fix it, unbelive that, i think it included in Hass System

Try below code, and add sensor to your config (if spliting files, add this to sensors.yaml)

sensor:
  - platform: time_date
    display_options:
      - 'time'
      - 'date'
      - 'date_time'
      - 'date_time_utc'
      - 'date_time_iso'
      - 'time_date'
      - 'time_utc'
      - 'beat'