Time.Calc is the perfect tool to work with time! Its intuitive user interface makes even complicated time calculations simple. Both 24h and am/pm are supported. Especially the data in flight logs can be handled easily. Time.Calc also includes a convenient way to calculate working hours. This is perfect for employees, students, or freelancers. Features: - Calculate the duration between two points of time - Add and subtract durations - Flexible design: you can work with only hours and minutes for work time but include seconds whenever you want - Tap sounds for all buttons (can be switched off) - Configurable rounding options: Results can be rounded up to a variety of different intervals. Useful, if you bill for every hour commenced. - Supports negative values as input parameter and result - mail your calculations or save them to the internal calendar - iPad version with convenient protocol of previous calculations