how to calculate no of days between two dates using with onchange function in openerp? - openerp-7

Question

I've created a custom field called caldays in payslip screen and in this field I want to get days between from_date and to_date in openerp with onchange function please help me with code
I got below code but how can I put it onchange function
datej = str(payslip.date_to)
datek = str(payslip.date_from)
dj = datej[-2:]
x=0
new = 0
while (x<=31):
x= x+1
if str(x) == dj or "0"+str(x) == dj:
new= x
dk = datek[-2:]
y=0
old = 0
while (y<=31):
y= y+1
if str(y) == dk or "0"+str(y) == dk:
old= y
caldays = new-old + 1
result = caldays

Answer 1

Try this, this will give no. of days, you have to give two arguments in this, i.e
date_from and date_to. Don't forget to import (import datetime and import math)
you can put your fields in xml,
<field name="date_from" on_change="get_number_of_days(date_from,date_to)"/>
<field name="date_to" on_change="get_number_of_days(date_from,date_to)"/>
<field name="number_of_days_temp"/>
and for your py file,
def get_number_of_days(self, date_from, date_to):
"""Returns a float equals to the timedelta between two dates given as string."""
if (date_to and date_from) and (date_from <= date_to):
DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"
from_dt = datetime.datetime.strptime(date_from, DATETIME_FORMAT)
to_dt = datetime.datetime.strptime(date_to, DATETIME_FORMAT)
timedelta = to_dt - from_dt
diff_day = timedelta.days + float(timedelta.seconds) / 86400
result['value']['number_of_days_temp'] = round(math.floor(diff_day))+1
else:
result['value']['number_of_days_temp'] = 0
return result
Hope this will help you.