Allow for CxoTime() to get current time in date format

[taldcroft]

Description

This allows for CxoTime() as a drop-in replacement for DateTime(), thus making migration easier. It also overrides the now() class method to return the time in date format instead of datetime as in the Time base class.

Generally speaking, new code should use CxoTime.now() as being more explicit, but either way is OK.

Testing

• Passes unit tests on MacOS
• [N/A] Functional testing

You might be interested @jzuhone and @matthewdahmer.