(DateTime().earliestTime() + gap).earliestTime(), since
DateTime().__add__() returns a different tz offset if daylight saving
changes.

For example (timezone is Europe/Paris):

>>> DateTime().earliestTime()
DateTime('2008/10/24')
>>> DateTime().earliestTime()._tz
'GMT+2'
>>> (DateTime().earliestTime()+10)
DateTime('2008/11/03')
>>> (DateTime().earliestTime()+10)._tz
'GMT+2'
>>> DateTime(str((DateTime().earliestTime()+10)))
DateTime('2008/11/03')
>>> DateTime(str((DateTime().earliestTime()+10)))._tz
'GMT+1'


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24312 20353a03-c40f-0410-a6d1-a30d3c3de9de