Folder contents properties action does not set tzinfo for dates

[csanahuja]

BUG/PROBLEM REPORT (OR OTHER COMMON ISSUE)

What I did:

1. Create a document and publish it.
2. Change publish/effective date editing the document.
3. Change the same date in the folder_contents properties action button

What I expect to happen:

Step 2 and 3 should set the date the same way

What actually happened:

Step 2 saves the timezone. Step 3 does not.

What version of Plone/ Addons I am using:

Clean installation

Plone 5.1.4 (5114)
CMF 2.2.12
Zope 2.13.27
Python 2.7.14
PIL 5.3.0 (Pillow)

More info:

Starting the client in debug mode:

Step 2 output:

>>> app['filesystem']['site'][document'].effective_date
DateTime('2019/04/30 10:00:00 GMT+2')

Step 3 output

>>> app['filesystem']['site'][document'].effective_date
DateTime('2019/04/29 10:00:00 GMT+0')

Making some testing with DateTime I got this results:

>>> from DateTime import DateTime
>>> from datetime import datetime
>>> # Creating DateTime w/o param sets GMT
>>> DateTime()
DateTime('2019/04/29 10:24:50.212822 GMT+2')
>>> # Creating DateTime with string does not set GMT (I guess we need to pass the GMT as part of the string)
>>> DateTime('2019-04-29 10:00')
DateTime('2019/04/29 10:00:00 GMT+0')
>>> # Creating DateTime with datetime instance sets GMT
>>> DateTime(datetime.strptime('2019-04-29 10:00:00', '%Y-%m-%d %H:%M:%S'))
DateTime('2019/04/29 10:00:00 GMT+2')

So my workaround was this:

# Need to import datetime
if self.effectiveDate and hasattr(obj, 'effective_date'):
    self.effectiveDate = datetime.strptime(self.effectiveDate, '%Y-%m-%d %H:%M')
    obj.effective_date = DateTime(self.effectiveDate)

The same applies to expiration date