This assumes you have installed Ansible and are familiar with the ansible-playbook command and have created a playbook.

ansible_date_time is a built in variable that returns date/time. In this example, a date in the format of yyyy-mm-dd will be returned.

- debug: msg="{{ ansible_date_time.date }}"

However, what is usually preferred is to use lookup pipe so that you can format the date and time, like this.

- debug: msg="{{ lookup('pipe','date +%Y-%m-%d-%H-%M-%S') }}"

Or even better, create a date and time variables.

vars:
  date: "{{ lookup('pipe','date +%Y-%m-%d') }}"
  time: "{{ lookup('pipe','date +%H:%M:%S') }}"