Time Class

I read on the website:
book.cakephp.org/3.0/en/core-libraries/time.html

I need to add

use Cake\I18n\Time;

But when i do that it doesnt work and says:
Error:   	Class 'Cake\I18n\Time' not found	
If i go look there there is no Time class only a I18n Class.

I need to use DateTime function to get a certain date by giving year week and day numbers.

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