ansible/roles/i2c-clock/tasks/set-time.yml

---
- name: Check if rtc is loaded
  stat:
    path: /dev/rtc
  register: rtc_file

- become: yes
  when: rtc_file.stat.exists == False
  block:
    - name: load hwclock
      shell:
        cmd: |
          modprobe rtc-ds1307
          echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
    - name: update time
      shell:
        cmd: |
          hwclock -w
    - name: read time
      shell:
        cmd: |
          hwclock -r