How to work with datetimes and formats in Ansible?

I have these 3 tasks:

  - name: Obtain facts
    ansible.builtin.setup:

  - name: Get date time
    ansible.builtin.set_fact:
      current_date: "{{ ansible_facts.date_time.date | strftime('%d-%m-%Y') }}"

  - name: Set timing for maintenance window
    ansible.builtin.set_fact:
      maintenance_start: "{{ ansible_facts.date_time.iso8601 | strftime('%Y-%m-%dT%H:%M:%S') }}"
      maintenance_end: "{{ (ansible_facts.date_time.epoch | int + 3600) | to_datetime('%s') | strftime('%Y-%m-%dT%H:%M:%S') }}"

I have 2 main goals:

1. Obtaining the current date in the format dd-mm-YY
2. Obtaining the current date and time in the following format 2025-02-21T10:33:00 and after that add 1 more hour to the var in maintenance_end

I have this in my ansible_facts

{
    "ansible_facts": {
      "date_time": {
        "year": "2025",
        "month": "02",
        "weekday": "Wednesday",
        "weekday_number": "3",
        "weeknumber": "07",
        "day": "19",
        "hour": "11",
        "minute": "51",
        "second": "28",
        "epoch": "1739976688",
        "epoch_int": "1739976688",
        "date": "2025-02-19",
        "time": "11:51:28",
        "iso8601_micro": "2025-02-19T14:51:28.648606Z",
        "iso8601": "2025-02-19T14:51:28Z",
        "iso8601_basic": "20250219T115128648606",
        "iso8601_basic_short": "20250219T115128",
        "tz": "-03",
        "tz_dst": "-03",
        "tz_offset": "-0300"
      },
   }
}

But I'm reciving this error:

TASK [my-playbook : Get date time] *********************************
task path: /runner/project/my-playbook/tasks/04-maintenance_window.yml:2
fatal: [host1]: FAILED! => {"msg": "Invalid value for epoch value (%d-%m-%Y)"}
fatal: [host2]: FAILED! => {"msg": "Invalid value for epoch value (%d-%m-%Y)"}
fatal: [host3]: FAILED! => {"msg": "Invalid value for epoch value (%d-%m-%Y)"}

Any hits or clue of what is the error?

Q: "Obtaining the current date in the format dd-mm-YY"

A: That is almost or already available (somehow) within ansible_facts.date_time.

  - name: Get date time
    ansible.builtin.set_fact:
      current_date: "{{ ansible_facts.date_time.day ~ '-' ~ ansible_facts.date_time.month ~ '-' ~ ansible_facts.date_time.year }}"

or

  - name: Get date time
    ansible.builtin.set_fact:
      current_date: "{{ date_elements | join('-') }}"
    vars:
      date_elements:
        - "{{ ansible_facts.date_time.day }}"
        - "{{ ansible_facts.date_time.month }}"
        - "{{ ansible_facts.date_time.year }}"

Q: "Obtaining the current date and time in the following format 2025-02-21T10:33:00 and after that add 1 more hour to the var in maintenance_end"

A: A minimal example playbook

---
- hosts: localhost
  become: false

  gather_facts: true
  gather_subset:
      - 'date_time'
      - '!min'

  tasks:

    - debug:
        var: ansible_facts

    - debug:
        msg: |
         "maintenance_start: {{ '%Y-%m-%dT%H:%M:%S' | strftime(ansible_facts.date_time.epoch) }}"
         "maintenance_end: {{ '%Y-%m-%dT%H:%M:%S' | strftime(ansible_facts.date_time.epoch | int + 3600) }}"

will result into an output of

TASK [debug] *******************************
ok: [localhost] =>
  msg: |-
    "maintenance_start: 2025-02-21T18:45:00"
    "maintenance_end: 2025-02-21T19:45:00"