All digital video camera leave a date and time stamp on each frame. In fact it is this 'Timecode' is used by most capture packages to batch scenes. In addition the camera itself (Optionally) displays the timecode when the user requires.
In general terms though the Timecode is invisible off line. There are software packages available to display this if required. I recall (ages ago) posting a link to such software. I will search about and see if I can find it.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.