Add support for timezones of git log messages

[andygrunwald]

This PR solves #63

The timezone is saved in seconds. Some examples:

CommitDate: Sun Apr 20 18:33:46 2014 +0200
=> 7200 (Germany)

CommitDate: Tue Feb 11 22:10:39 2014 -0800
=> -28800 (USA, California, Santa Cruz)

CommitDate: Sun Apr 20 16:07:36 2014 +0530
=> 19080 (India)

If you ran CVSAnaly on MySQL you can migrate your database with the queries:

ALTER TABLE scmlog 
  ADD COLUMN date_tz INT AFTER date,
  ADD COLUMN author_date_tz INT AFTER author_date;

@linzhp maybe this is useful for you as well?

[linzhp]

Why do you want to convert the timezone into seconds? Isn't something like "+0200" more readable?

[andygrunwald]

This was the idea from @jgbarah, because the same approach is used in MailingListStats.
See #63 for discussion.

Further more to save the seconds is
a) more efficient in database storage (int vs. char / varchar)
b) better usable in calculations in programing (calculation instead of string parsing)

@linzhp did you test it? Does it work for you?

[andygrunwald]

Any updates here @jgbarah @sduenas @linzhp ?
Can i merge this?

[linzhp]

I just tested it, it works. Just a side comment, the time zone information are not always reliable, as when a commit is imported from Subversion to Git, the time zone is always +0000. Not a bug in this PR, but something we need to pay attention to when we want to use time zone information.

[andygrunwald]

Is there a way to derect migrations from Subversion to Mark those commits?

Am Montag, 28. April 2014 schrieb Zhongpeng Lin :

I just tested it, it works. Just a side comment, the time zone information
are not always reliable, as when a commit is imported from Subversion to
Git, the time zone is always +0000. Not a bug in this PR, but something we
need to pay attention to when we want to use time zone information.

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[linzhp]

Yes, those commits often has a string "git-svn" in the commit message.

[andygrunwald]

I think we should integrate a feature like this (as a Extension?), but this
should be separated from the timezone feature.
But good point Zhongpeng!

Am Dienstag, 29. April 2014 schrieb Zhongpeng Lin :

Yes, those commits often has a string "git-svn" in the commit message.

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[sduenas]

Sorry for not responding sooner. I've been busy these days.
Thanks to @andygrunwald for this cool feature and to @linzhp for you contribution.
Merged in 404d43d

[andygrunwald]

Thanks @sduenas!
Regarding the git-svn bridge, mentioned by @linzhp i created a new feature ticket: #83