The Firemen Calendar, which features firemen in various states of undress, has been a popular attraction for many years. Although the calendar has emerged as a humorous, lighthearted way to pay homage to brave firefighters, the calendar release started stirring up a different sort of discussion: the importance of calendars in roster management. As the world observed these calendars' precise and logical formation, it began to appreciate the vital role roster management plays in smoothly running any organization. That's where an efficient HR system comes into the picture.