[TYPO3-core] RFC: #10186: Time shifting (again) in datetime fields (followup to Bug#8746)

[Ernesto Baschny [cron IT]]

This is an SVN patch request.

Type: Bugfix (critical before 4.2.4 release!)

Bugtracker reference:
http://bugs.typo3.org/view.php?id=10186

Branches: TYPO3-4_2 and trunk

Problem(s):
After fix for #8746, the behaviour from bug#7897 was re-introduced.

Solution:
See attached patch. The newly introduced method
convertClientTimestampToUTC() was calculating the offset to UTC using a
incorrect reference date (the offset to UTC changes if the reference
date is in DST). "timestamp" send to the method is a timestamp in
seconds, while javascript "new Date(int)" expects a timestamp in
milliseconds.

How-to-reproduce:
Use the extension "user_datetest" for testing (see bug#8746).

Test the following:
1) create empty new record

2) click on checkbox near "date/time" field to get current date+time (we
are not in DST yet).

3) change date to some date after the DST-switch (so some day in summer,
say in June-2009).

4) move focus away:
  - expected: date time to stay as entered
  - buggy: time shifts back 1 or 2 hours (if your client is in a region
where DST applies and you are currently not in DST).

Now apply the patch and try it out again. Note: As the .js file is
changed, you need to force your browser to reload them after patching
(SHIFT-reload on Firefox, CTRL-reload on IE).

Cheers,
Ernesto


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