No, a PDC code was just start time, channel and date. Though I'm fairly certain that if you set it for, say, 20:00 every Thursday on BBC1 that it would work.
Unless of course one week they scheduled it on a Friday, though if it was scheduled on a Thursday and then moved to the Friday (as happened a lot 20 years ago this week) then it would record on Friday (assuming that the broadcaster didn't change the code)
The critical thing about PDC was the programme ID code was generated by the
(i.e what was in Radio Times etc) start and finish times. If you tried to be helpful, and set the start time to the actual (for instance 19:28 for EastEnders) nothing would get recorded. Early (and late) start programmes were not a problem as long as you adhered to the published times. What some VCRs did, was to use the VideoPlus codes (that were printed in guides) as a method to set recordings. This led to a common belief that VideoPlus was PDC, (which it wasn't)