Shifts the time to the given offset in seconds from the live edge. The resulting offset has to be within the timeShift window as specified by maxTimeShift (which is a negative value) and 0. When the provided offset is positive, it will be interpreted as a UNIX timestamp in seconds and converted to fit into the timeShift window. When the provided offset is negative, but lower than maxTimeShift, then it will be clamped to maxTimeShift. Has no effect for VoD.