Nursing Management, a true oxymoron

Moron is truly the operative part of the phrase. While the rest of the world functions on a monthly schedule that actually spans from the first to the last of the month the parallel universe of nursing schedules from the 15th to the 15th. Can anyone out in the real world explain why? Or is it just another way to make life all that much more inconvenient? Okay, I fell a little better now.