Method for calculating on-port days of marine freight unloading port

The invention discloses a method for calculating the on-port days of a marine freight unloading port, and relates to the technical field of shipping charge calculation, and the method comprises the steps: calculating the time period of a storage window period when the time of the window period of the unloading port is obtained; calculating the calculation of the time interval by a calculation system; the calculation system includes an input judgment module used for automatically comparing and judging whether the NOR submitting time is earlier than the unloading window period or not when receiving and knowing the unloading port window period and the ship captain NOR submitting time, and a calculation comparison module is used for calculating whether the NOR submitting time is earlier than the unloading window period or not when the input judgment module judges that the NOR submitting time is earlier than the unloading port window period. The calculation and comparison module can automatically compare the start