The Doppler shift formula relates two proper time intervals measured in I and I' respectovely (tau)=D(tau)' D representing a Doppler factor that depends on the relative speed of I and I'. By definition the events involved in I and I' respectively take place at the same point in space. If the two involved events are simultaneous say in I they are simultaneous in I' as well and vice-versa. The time intervals measured by clocks synchronized using the "everyday clock" synchronization procedure are related by a Doppler shift like formula. Could that be an explanation of the absolute simultaneity: two events simultaneous say in I and taking place at the same point in space are simultaneous in all inertial reference frames. We find the same situation in the case of Selleri's approach.