Demo11

- helper code, to validate a time
- written as a method
 - describe the details of the method
 - static boolean, parameters, etc

Show how it is called

Note it is called twice, justifying existence!
 - alternative justification is neatness/design/stepwise-refinement

Discussion: make diff more meaningfull

Demo11a
Same as Demo11, but we declare the method AFTER we use it!
 - style, which do you prefer?
 - I like early rather than late declaration
  - old school I guess