MantisBT timezone warning (date_default_timezone_get)

For a proof-of-concept, I had to install a new Mantis Bug Tracker instance and after finishing the installation, the login screen greeted me with the following warning:

SYSTEM WARNING: date_default_timezone_get(): It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ‘UTC’ for ‘UTC/0.0/no DST’ instead

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