[ALL] ir.cron nextcall: not working properly on a localized server

[Shide]

odoo/odoo/addons/base/models/ir_cron.py

Line 136 in 1527db8

now = fields.Datetime.context_timestamp(cron, datetime.now())

In this line we pass a local datetime to the fields.Datetime.context_timestamp function. If we have a localized server, we will have problems if our CRON increment is less than a day (minutes or hours).

Passing datetime.utcnow() to fields.Datetime.context_timestamp function, will ensure the correct behavior on all server configurations.

fields.Datetime.context_timestamp function must receive an UTC naive datetime.
When our server is localizated, datetime.now() don't have timezone (is naive), but the datetime is on local timezone. If we use datetime.utcnow(), will be naive too and the date will be on utc (the right value for fields.Datetime.context_timestamp)

The resulting line will be like this:

now = fields.Datetime.context_timestamp(cron, datetime.utcnow())