Abstract: In synchronous time relationship, human languages share some characteristics in encoding time markers:(1) Time words of relative time tend to have zero marker; (2)Markers of absolute time on the conceptual hierarchy should abide by the adjacency principle."Year" and "month" tend to share the same marker; (3) If "year" is encoded with zero marker, "month" and "day" will consequently be encoded similarly.Zero marker is used in the extension from the core of relative time to absolute time.