Failing tests for DateValidator with ICU tzdata 2017c

[Vovan-VE]

I'm not sure is it related to Yii itself or not.

What steps will reproduce the problem?

0. Catch the fact that built-in ICU tzdata became outdated. Same timestamp with specific time zone produce different output between intl and native PHP's TZ handling.
1. Update ICU tzdata to latest 2017c according to ICU manual linked from Yii guide. Same things are described here (ru).
2. Run Yii2 tests for validators.

What is the expected result?

Tests passed.

What do you get instead?

There were 3 failures:

1) yiiunit\framework\validators\DateValidatorTest::testIntlValidationWithTime with data set #0 ('UTC')
Failed asserting that false is true.

.../tests/framework/validators/DateValidatorTest.php:318
.../vendor/phpunit/phpunit/phpunit:52

2) yiiunit\framework\validators\DateValidatorTest::testIntlValidationWithTime with data set #1 ('Europe/Berlin')
Failed asserting that false is true.

.../tests/framework/validators/DateValidatorTest.php:318
.../vendor/phpunit/phpunit/phpunit:52

3) yiiunit\framework\validators\DateValidatorTest::testIntlValidationWithTime with data set #2 ('America/Jamaica')
Failed asserting that false is true.

.../tests/framework/validators/DateValidatorTest.php:318
.../vendor/phpunit/phpunit/phpunit:52

FAILURES!

Additional info

Q	A
Yii version	2.0.13
PHP version	7.0.22-0ubuntu0.16.04.1
Operating system	Ubuntu
libicu55	55.1-7ubuntu0.3

[schmunk42]

Related: #13750

[schmunk42]

The data format has slightly changed, I think. I just debugged this on PHP 7.2.

When changing the failing lines to:

$this->assertTrue($val->validate('31/05/2017, 12:30'));
$this->assertTrue($val->validate('31.05.2017, 12:30'));

...tests pass. I found this by using the formatter.