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ABU K

def onchange_dates(self, cr, uid, ids, checkin_date=False, checkout_date=False, duration=False):
        # This mathod gives the duration between check in checkout if customer will leave only for some hour it would be considers as
        # a whole day. If customer will checkin checkout for more or equal hours , which configured in company as additional hours than
        # it would be consider as full day
        value = {}
        company_obj = self.pool.get('res.company')
        configured_addition_hours = 0
        company_ids = company_obj.search(cr, uid, [])
        if company_ids:
            company = company_obj.browse(cr, uid, company_ids[0])
            configured_addition_hours = company.additional_hours
        if not duration:
            duration = 0
            if checkin_date and checkout_date:
                chkin_dt = datetime.datetime.strptime(checkin_date, '%Y-%m-%d %H:%M:%S')
                chkout_dt = datetime.datetime.strptime(checkout_date, '%Y-%m-%d %H:%M:%S')
                dur = chkout_dt - chkin_dt
                duration = dur.days # here I want to update the time difference betwenn two dates how ?
                if configured_addition_hours > 0:
                    additional_hours = abs((dur.seconds / 60) / 60)
                    if additional_hours >= configured_addition_hours:
                        duration += 1
            value.update({'value':{'duration':duration}})   #Now currenly its update days ,i need the time between two dates

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Temur
Mejor respuesta

You've to use timedelta from datetime package, please see: timedelta documentation 

you can import it in python using:

from dateitime import timedelta

then use timedelta in your code to calculate the difference you're interested in.

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ABU K
Autor

where I can use time delta If I use timedelta then is it possible to acess this way duration = dur.time

Temur

the equivalent code of your code using timedelta will be something like: 

 if not duration:
            duration = timedelta(0)
            if checkin_date and checkout_date:
                chkin_dt = datetime.datetime.strptime(checkin_date, '%Y-%m-%d %H:%M:%S')
                chkout_dt = datetime.datetime.strptime(checkout_date, '%Y-%m-%d %H:%M:%S')
                dur = chkout_dt - chkin_dt  # dur is timedelta object as a result of "chkout_dt - chkin_dt" 
                duration = dur 
                if configured_addition_hours > 0:
                    additional_hours = abs((dur.seconds / 60) / 60)
                    if additional_hours >= configured_addition_hours:
                        duration += timedelta(days=1)
             value.update({'value':{'duration':duration.days}})
actually dur is timedelta object, as you've got it by subtraction of one date from another(dur = chkout_dt - chkin_dt) and "duration" seems to be extra. you'll need adapt it to your application logic.
Temur

in reply to your comment in your code 

duration = dur.days # here I want to update the time difference betwenn two dates how ?
- the variable 'dur' is a timedelta object, which is actually represents the time difference betwen two dates... so you've just to use it according your application logic.
ABU K
Autor

Thax Temur for your valuabel replay and response..