Timestamp data in MOV (QT) files?

To close off this thread and for anyone interested, here's a reply I
received in one of the vide forums, conforming my suspicion that
cameras make their own rules:
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Correct. Actually, it is the writing app/firmware. There are
"standards" but there are enough of them that YMMV.

Some cams record Timecode (smpte/ebu or otherwise), some record a
starting "timestamp" (both as metadata tracks/streams SEPARATE from
V+A), some use the container created start stamp, some the container
modified start stamp, some use an ENDING stamp. Some don't really do
any at all (though they may include this info in other areas, as in
the case of some AVCHD clips which keep that in the CLIP List info).

Figure out how it works for a particular cam, and follow that protocol
when using footage from that cam, then follow different rules for
different cams. Maybe even do it manually.

Sorry, that's the way it goes...
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Terry, East Grinstead, UK