file_last_updated.yml

---
- hosts: localhost
  gather_facts: true
  connection: local
  # user: ansible
  # become: true
  vars:
    # Define path to file to check
    # file_to_check: /etc/ansible/ansible.cfg
    # file_to_check: $HOME/ansible.cfg
    file_to_check: ansible.cfg
  tasks:
    - name: get the file
      stat:
        path: "{{ file_to_check }}"
      register: file_info

    - name: Set last modification of {{ file_to_check }} time in epoch
      set_fact:
        last_modified: "{{ file_info['stat']['mtime'] }}"

    - name: Display last modified time of {{ file_to_check }} in epoch
      debug:
        var: last_modified

    - name: Set current time in epoch
      set_fact:
        current_time: "{{ ansible_date_time['epoch']|int }}"

    - name: Displaying current time in epoch
      debug:
        var: current_time

    - name: Set time since {{ file_to_check }} was last modified
      set_fact:
        last_modified_from_current_time: "{{ (current_time|int - last_modified|int) }}"

    - name: Display number of days since {{ file_to_check }} was last modified
      debug:
        msg: "Has been {{ (last_modified_from_current_time|int/86400)|round(0,'floor') }} of days since last update"