Abstract: A time calibration method includes a first station receives a first frame from a second station; the first station stores a receiving moment of the first frame; the first station receives a second frame from the second station, where the second frame includes a sending moment at which the second station sends the first frame; and the first station obtains a clock offset between a first clock of the first station and a second clock of the second station based on the receiving moment of the first frame and the sending moment of the first frame.