Input_datetime and utc

Looking for help, please. What don’t I understand?

I created an input_datetime helper: input_datetime.peter .

I called this service on Developer Tools / Services …

service: input_datetime.set_datetime
  datetime: "{{ utcnow() }}"
  entity_id: input_datetime.peter

Using Developer Tools / Template …

{{ (as_timestamp(utcnow()) - as_timestamp(as_datetime(states('input_datetime.peter')))) / 3600 }}

the result is …

Result type: number

It didn’t take an hour to write the template. Time zone in the UK is UTC+1 currently. Does input_datetime always return values as local time?