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quiz reports MDL-21111 Quiz duration is reported in years if Time Fin…
…ish is before Time Start Suppose you have two load-balanced servers with badly-synchronised clocks, and a student does a really quick quiz attempt. Then it is possible that quiz_attemtp.timestart is greater than quiz_attemtp.timefinish. And these columns are unsigned (on MySQL) so timefinish - timestart is compulted as a number close to 2^64, which is about 42 times the age of the universe. Do the subtraction in PHP instead. (But we still need to compute a duration columnin PHP because sometimes we sort on it.)
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