As the title says, I may be missing something. The scenario is provided below.

Versions used

Laravel Version: 5.4.3 PHP Version: 7.0.15 Database Driver & Version: MariaDB 10.1.20

Problem

The Laravel ‘date_format’ validation rule on Requests fail on the date ‘2017-02’. It fails on non leap years when using the month ‘02’ (February).

Test Data

Working on the following dates [Validation is successful]

2016-01 2016-02 2020-02 2024-02

Not working on the following dates [Validation does not match the format Y-m]

2013-02 2017-02 2021-02

Steps to Reproduce

Create a request with the following rule

return ['testDate' => ['bail', required, 'date_format:Y-m']];

Next steps

Create a sample input form, route, and controller that uses the request created. Input the test data provided above. Input test data ‘2017-02’. Expected: Validation Passed, Actual: Does not match the format Y-m

Other notes

The validation rule ‘date’ works properly even on non leap years when using the month ‘02’ (February). Tested on Laravel 5.3, same error.