I ran tests (`bin/rails test`) and got
```
Error:
ReportsControllerTest#test_every_route_should_work_for_moderators:
ActionView::Template::Error: Database missing time zone support for Etc/UTC - see https://github.com/ankane/groupdate#for-mysql
app/views/reports/users.html.erb:17:in `_app_views_reports_users_html_erb__3530160556563631482_308000'
test/controllers/reports_controller_test.rb:25:in `block (2 levels) in <class:ReportsControllerTest>'
test/controllers/reports_controller_test.rb:24:in `each'
test/controllers/reports_controller_test.rb:24:in `block in <class:ReportsControllerTest>'
```
Searching for the error message only gave [a site in Japanese](https://xkoh.hatenadiary.com/entry/MySQL_TimeZone) with the exact error message, but I couldn't read it. Is it a big problem?