Date and time improve - #260

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DeryabinSergey:date-and-time-improve

Commits on Apr 25, 2021

Don't need generate create() method if exists in parents. Create method in parent MUST return static
DeryabinSergey
committed
97ce57b
First iteration. Add comments and types. DateRange tests coverage
DeryabinSergey
committed
e205b9e