\section{Overview}The Modeling Framework (MF) Time Management Library provides utility functions for time and date calculations, and higher-level functions that control model time stepping and alarms.  The interface has been designed with use by Earth system models specifically in mind. The use of encapsulated classes for date, time and time of day  allows for a wide range of values and precision so that applications from weather forecasting to paleoclimate simulation are supported.  The design of this Time Management Library is based on the time management utilities in the Flexible Modeling System from the NOAA Geophysical Fluid Dynamics Laboratory.