Code that is exercised once in a century (see: y2k and similar timestamp problems) is buggier than code that is exercised once every six months (leap seconds) o

Code that is exercised once in a century (see: y2k and similar timestamp problems) is buggier than code that is exercised once every six months (leap seconds) or in real time (NTP, which given the poor precision of internal clocks, everyone should be running anyway).