from openerp.fields import Datetime, Field
ISODATEFORMAT = '%Y-%m-%d'

Newdatetime = Datetime.convert_to_export
def convert_to_export(self, value, env):
   timezone = pytz.timezone(env.context.get('tz'))
   return_val = Newdatetime(self, value, env)
   if isinstance(return_val, datetime.datetime) and return_val:
       return self.to_string(return_val.replace(tzinfo=pytz.timezone('UTC')).astimezone(timezone))
   elif return_val:
       return self.to_string(self.from_string(return_val).replace(tzinfo=pytz.timezone('UTC')).astimezone(timezone))
   return return_val
Datetime.convert_to_export = convert_to_export


import datetime, pytz
from odoo.fields import Datetime

Newdatetime = Datetime.convert_to_export


def convert_to_export(self, value, record):
 timezone = pytz.timezone(record._context.get('tz'))
 return_val = Newdatetime(self, value, record)
 if isinstance(return_val, datetime.datetime) and return_val:
     return self.to_string(return_val.replace(tzinfo=pytz.timezone('UTC')).astimezone(timezone))
 elif return_val:
      return self.to_string(self.from_string(return_val).replace(tzinfo=pytz.timezone('UTC')).astimezone(timezone))
return return_val
Datetime.convert_to_export = convert_to_export