We use Relius documents (PPD version). In one of their document seminars, they went through a similar situation and described months of service as simply a passage of time. So, if an employee was employed on the entry date, they entered on that date regardless of how many times they may have been terminated and rehired. If that is the case, I think both of your examples would result in an entry date on the rehire date. (Of course, other documents could be worded differently.)