Callum Macdonald e98f4541f1 later - next() can return single date (#42127) ...

* next() can return single date

* More methods return a single Date

* Typecast returned value

I don't really understand what these tests are supposed to be doing, but I think this change will work.

* Add space for tslint

2020-02-06 09:49:29 -08:00

..

index.d.ts

…

later-tests.ts

…

tsconfig.json

…

tslint.json

…