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The usergetdate function is not only used to display dates, it is also passed to the function make_timestamp. This means users using another calendar type other than Gregorian will generate incorrect timestamps which may be saved in the DB or used to populate the date_selector and date_time_selector elements. For example, when creating an assignment using another calendar type other than Gregorian, the mod_form.php file calls $this->apply_admin_defaults() which uses the function usergetmidnight to set the "Allow submissions from" date to today's date and the "Due date" field to 7 days in the future. The usergetmidnight function calls usergetdate which is then passed to make_timestamp. Since the usergetdate function was using the calendar type's timestamp_to_date_array function the date being passed to make_timestamp was not in Gregorian. So, when using the hijri calendar the year 1434 was being passed which was generating a large negative number as the timestamp which was then used to populate the date fields.