Update 01-chapter3.markdown
Expl: in `git log --after=2008-10-01` the time defaults to the time the command is run.
So e.g. the command is equiv to `git log --after="2008-10-01 09:00:00"` when run at 09:00:00
Set dummy merge driver merge ours .gitattributes.
how to robustly use `git log` and limit the commits by date/time

* show that CommitDate is considered, when using `--after` and `--before`
* show that `--after` means on-or-after and `--before` means on-or-before
* best practices: show how to limit by absolute time (ISO format),
  so that the log command's results are identical for everyone around the
  world
* format dates returned by git log according to your timezone of choice,
  using TZ (tested on GNU/Linux and Windows) and `--date=local`
* explain how `--after=2008-06-01` default to using time when command is
  run; and how offsets from UTC are (in this case) not corrected for
  DST changes.
minor: fix code formatting (for pdf output)
provide timezone-examples from different Cities
* Auckland/New Zealand, Berlin, etc. -- not just Paris
* minor corrections
minor: remove repetition ("committed")
shorten explanation for `git log --after=2008-06-01` (date-only)
`git log --after=2008-06-01` keeps timezone offset from UTC equiv.
to the time when it is run on your computer.
Saying this is "disregarding Daylight Saving Time" is confusing,
because it could lead one to mistakenly assume that git then
only considers summer-time, or only winter-time. But this is
not the case. Git just keeps the offset from UTC identical.
[fr] Update chapter on diffing
[fr] sync with 90c92ceb
[fr] sync with 21e84add
[fr] sync with 2a0a8371
[fr] apply 15f2bf1b
[fr] apply bdef6f76 and 1ca5ef16
(working directory clean) message change.

This change was introduced in git at
https://github.com/git/git/commit/50bd8b7eb960ff7a646195e0751b48a0e57e03ad
Update 01-chapter1.markdown

The sentence did not make sense, so I hopefully could write it in a more clear format.
Merge pull request #781 from FrankLo/patch-1

Update 01-chapter1.markdown
Merge pull request #780 from wakeup/master

Update 01-chapter3.markdown
fix  chap 4.