Adjust expected string for different time zones

[jclarkeSTFC]

Running this test with your computer set to a non-UTC time zone will result in a different output, because the time is written out in local time. Hence we have to adjust our expected output.

To test:

Tests should pass

If you want to experience the test failing, then on Linux you can set the TZ environment variable to e.g. Asia/Singapore, then run the test. On Windows you will need to change your system time zone, which you can do e.g. from a command prompt with tzutil /s "Pacific Standard Time", (don't forget to change it back).

This does not require release notes because it's only a change to test code.

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[AndreiSavici]

Works as expected

[rbauststfc]

Andrei has confirmed that the test is now passing for him and it's also passing our CI tests, which are in a different time zone, so this fix looks good. Thanks very much @jclarkeSTFC for looking at this one!

@adriazalvarez, if you're planning to make changes to this test class for the issue you're working on at the moment then you might want to update your branch once this is merged in to avoid any potential merge conflicts.