Definition of time when "t = 0" in different waveforms

Hi all, I am confused about the definition of time when t = 0. As the file of IMRPhenomXHM in the LALSimulation says, the time when t = 0 refers to the time of coalescence, while I found no clear definition of t0 for EOB waveforms (maybe I just simply missed it). Besides, I noticed that for SEOBNRE, it is likely set to the peak time, which really confused me since tc and tpeak should be different.
Thanks.