when i was install project module at that time it will give me an error like 

ParseError: "date/time field value out of range: "2015-13-01"

LINE 1: ... 'normal', 1, 'You can set a deadline on a task', '2015-13-0...

^

HINT: Perhaps you need a different "datestyle" setting.

" while parsing odoo/odoo-9.0/addons/project/project_data.xml:293, near

<record id="project_task_data_11" model="project.task">

<field name="user_id" ref="base.user_root"/>

<field name="priority">0</field>

<field name="project_id" ref="project.project_project_data"/>

<field name="name">You can set a deadline on a task</field>

<field name="stage_id" ref="project_stage_data_1"/>

<field name="date_deadline" eval="'2015-%s-01' %(datetime.now().month+1)"/>

</record>

Bcoz the current month is December (12) when it will get one month increment at that time it will give me 13 but it is actually wrong as per the calendar.

here instead of  2015-13-01 of 2016-01-01