Remove useless function

[colemanw]

Overview

Removes unnecessary function which does nothing except call another function and is only used once.

Before

Unused

After

Gone

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[demeritcowboy]

Could we just get rid of this function? It's only used one place in universe and it doesn't do what you would expect from a function called isDate() - I'd assume it checks if it's a valid date, but that's not what it does.

[colemanw]

@demeritcowboy good call!

[eileenmcnaughton]

test this please