I am in the time zone America/Bogota (-5) and if I Post a Account Move (account.move) after the 19:00 (in my timezone) the field move.post_date(http://hg.tryton.org/modules/account/file/tip/move.py#l409) stored has a difference of one day with the date that was posted.
I think this is about converting an datetime object to a date object(http://hg.tryton.org/trytond/file/tip/trytond/ir/date.py#l29) and that this difference varies depending on the time zone.
Is this the expected behavior?
Note: that topic may be related to this topic Change most Date fields by DateTime