[FIXED] i18nFormat with CakePHP 3 - Why does YYYY produce a different year than yyyy?

Issue

I'm working in CakePHP 3 and I noticed today that this:

    $time = new Time('now');

    $this->set('time', $time->i18nFormat('YYYY')); // echoes '2015'

Echoes 2015. Changing it to lowercase 'yyyy', instead, produces 2014.

    $time = new Time('now');

    $this->set('time', $time->i18nFormat('yyyy')); // echoes '2014'

Why is this the case?

Solution

Uppercase Y is the year that the week of the timestamp is in "Week of Year" based calendars. This week now, is in 2015 so it returns 2015. Lowercase y is the current year for the timestamp, which for now is 2014.

Date Field Symbol Table

Answered By - AbraCadaver