A range of commits can contain commits that are older than the first
commit due to rebasing.
A range of commits created using
is defined as the commits that are reachable from <rev2> but excluding
those that are reachable from <rev1>. "Reachable" means that a commit
can be navigated to using the parent reference that each commit has
embedded. So, strictly speaking, a range has nothing to do with dates. See
the Git revisions man page for more details.
During a rebase, the changes made in commits are used to create "copies"
of those commits. Those "copies" will have the same author and date as the
Let's say someone develops something for a long time on a local feature
branch, then rebases that feature branch on master and pushes. Then the
earliest commits that were rebased will probably have earlier dates than
the commits that they were rebased onto.