Use voluptuous for time/date sensors

[fabaff]

Description:

Related issue (if applicable): fixes 127528299

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: worldclock
    time_zone: America/New_York
    name: New York
  - platform: time_date
    display_options:
      - 'time'
      - 'date'
      - 'beat'

Checklist:

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If code communicates with devices, web services, or a:

• [] Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• [] New dependencies have been added to the REQUIREMENTS variable (example).
• [] New dependencies are only imported inside functions that use them (example).
• [] New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• [] New files were added to .coveragerc.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[balloob]

cv.time_zone 👍

[fabaff]

Thanks

[balloob]

Ok to merge when comments addressed 🐬