refactor(material/datepicker): unit test with not the first of the month (#24401)
refactor(material/datepicker): unit test with not the first of the month (#24401)

This change only affects the unit tests and doesn't not affect
application code. It's a small improvement to the unit tests in the
multi-year view to use Jan 3 instead of Jan 1. This can catch more bugs
because we could catch that we're setting a date to the first of the
month when we're not supposed to.
angular/components,angular/components,crisbeto/material2,crisbeto/material2,crisbeto/material2,angular/components,crisbeto/material2,angular/components