NOVELTY - The method involves detecting ignition-off by detector. An ignition-off time point and remaining pressure of object by hydraulic pressure sensor are stored (S200) on storage device. An ignition-on time point is stored (S400) when ignition-on is detected by detector. A lapse in time between ignition-on and off time point, and a reduced pressure based on lapse in time are calculated (S500,S600) by processor. A value obtained by subtracting reduced pressure from remaining pressure is set (S700) and applied as offset of hydraulic pressure sensor by the processor.    USE - Method for setting offset of hydraulic pressure sensor for sensing hydraulic pressure of object e.g. engine clutch of hybrid vehicle (all claimed). Can also be used in motor vehicles such as passenger automobiles including sports utility vehicle (SUV), bus, truck, various commercial vehicle, watercraft including variety of boats and ships, aircraft, electric vehicle, combustion, plug-in hybrid electric vehicle, hydrogen-powered vehicle, fuel cell vehicle.    ADVANTAGE - The soaking time and a remaining pressure period are prevented from affecting the offset of the hydraulic sensor, since the hydraulic pressure sensor is set by setting offset of the hydraulic pressure based on the remaining pressure of the engine clutch and the reduced pressure. The deterioration of drivability relating to engine clutch control in the hybrid vehicle is prevented, since the setting of an offset of a hydraulic pressure sensor is stabilized.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a system for setting offset of a hydraulic pressure which senses hydraulic pressure of an object to be sensed; and    (2) a non-transitory computer readable medium storing program instructions for setting offset of a hydraulic pressure which senses hydraulic pressure of an object to be sensed.    .    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating a method for setting offset of a hydraulic pressure sensor.    Step for storing ignition-off time point and remaining pressure (S200)    Step for storing ignition-on time point (S400)    Step for calculating apse in time (S500)    Step for calculating reduced pressure (S600)    Step for setting value obtained by subtracting reduced pressure (S700)