C-17 Duty Day Calc is a comprehensive duty day calculator designed for crews handling military cargo worldwide. This iPhone app streamlines the process of calculating duty day restrictions in Zulu and Local time zones. By entering key times like Alert, Show, or Takeoff, the app instantly computes all Vol-3 restrictions, eliminating the need for complex manual calculations.

Moreover, users can personalize the app by adding their own timelines, making it a versatile tool for duty day planning. The app also features a time calculator for determining start, duration, or end times, including the 781 decimal duration. With its user-friendly interface and practical functionalities, C-17 Duty Day Calc aims to enhance efficiency and accuracy in duty day management.