The time management model for business cooperation across organizations and business service grid has a special and important requirement, i.e. workday model. Workflow plays an important role in modeling of business processes in inter-enterprise or business service grid environment. However, current workflow time management model does not consider the difference of workday calendar. Aiming to this problem, this paper first defines some basic concepts involved in the workday calendar model, and presents a framework for workday calendar, i.e., workday model. Then the paper investigates the time constraints of the workday calendar model. Finally, an example is illustrated to explain the validity and practicality of the workday calendar model
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