D2,D3 to name a few can do this. This is done to the analog timecode signal only. The digital time code signal is recorded as part of the picture and can not be reinserted without erasing the picture. Hope all this helps. But I am still very fuzzy about what time code really is.
Time code is a generated signal that can be put on the tape in two ways.
It gives each frame a dedicated number so any single frame can be identified and searched for. The eight bits used give you two each of hours, minutes, seconds and frames. There is also a facility for adding user-bits, identification information you can add yourself. BTW the hours bits are often used to identify reel numbers instead of hours. It can only be recorded during shooting as it is a part of the picture information.