- use default application formatting for the date value
- auto adjust to application language and format setting changes
- be consistent with formatter and date validator

fixes #1551

Fixes #3197: Using `ActiveQuery::indexBy()` may cause relational AR queries to generate incorrect relational results

fixes #2593

Fixes #5143: yii\bootstrap\ActiveField::label() should not encode label if it is explicitly specified. [skip ci]

feature is not reliable

fixes #5136

fixes #4989

Enhances `normalizeDateTimeValue` to return a DateTime object instead of a converted double value, that fails. The DateTime object input is supported by 32 bit, 64 bit, as well as the `IntlDateFormatter` to format all years. (including fixing of the Y2K38 bug). Fixes issue in #4989.

close #5000

[ci skip] Update User.php

- https://github.com/blog/1892-third-annual-data-challenge-winners
- http://issuestats.com/github/yiisoft/yii2

delete spaces

Перевод runtime-logging на русский язык

Fixes #3725: Fixed the bug that the filtering condition used in relation definition was ignored when calling `ActiveRecord::unlinkAll()`

Fixed storing and loading nulls and booleans in Redis

asArray will not include null valued keys

fixes #1311

Fixes #5126

Removed `form` as a parameter to the events since it can be retrieved using `$grid.find('form.gridview-filter-form')`.

Events `beforeFilter.yiiGridView` and `afterFilter.yiiGridView` javascript events created for advanced use cases.

Trigger a new `filter.yiiGridView` event for yii grid view after grid filters are applied. This will enable developer to code a lot of use cases based on the grid filtering event. The filter `$form` can be accessed as a parameter to the event.

If you don't want to install command-line utils globally, you have to specify it's paths.

    public $commands = [
        'styl' => ['css', '@app/node_modules/bin/stylus < {from} > {to}'],
    ];

close #5130