In the GitLab CI environment, the command:
@header("Content-Type: text/plain");
Generates the Content-Type line of:
Content-Type: text/plain; charset=UTF-8
But on my workstation it generates this:
Content-Type: text/plain;charset=UTF-8
By adding that charset to our call to @header, we receive a
predictable result.
It seems PHP's date::setDate function doesn't do what we want when
you hand it a negative integer so we need to override a little more
of it's behaviour. We have to make sure that date::modify is not
called with a days greater than the month we might land in when we
add a number of months to it.
