How to set value to current datetime?

Community
1

I’m working through my first circleci build using aws-ecr orb and I want my tag to be set dynamically based on the current timestamp. How can I do that?

orbs:
  aws-ecr: circleci/aws-ecr@6.2.0
version: 2.1
workflows:
  # Build and push to ECR on builds to master
  build_and_push_image:
    jobs:
      - aws-ecr/build-and-push-image:
          account-url: AWS_ACCOUNT_URL
          aws-access-key-id: AWS_ACCESS_KEY_ID
          aws-secret-access-key: AWS_SECRET_ACCESS_KEY
          region: AWS_REGION
          repo: node
          tag: <HOW TO SET TAG TO CURRENT DATETIME????>
          filters:
            branches:
              only: master
2

Anyone have any idea? Is there any built in env vars available that would help?