This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You know how to convert days, hours and minutes into seconds. Converting seconds into days, hours and minutes is the inverse. The only "difficult" part is the splitting of one value into three values. Any part smaller than 1 day will be hours plus minutes; any part smaller than 1 hour will be minutes.