date-test.py

import arrow
import pprint

start = '2015-01-01'
end = '2015-01-02'

s = arrow.get(start)
e = arrow.get(end)

print s
print e

num_days = (e-s).days

def chunks(l,n):
    for i in xrange(0, len(l), n):
        yield l[i:i+n]

date_chunks = list(chunks(range(0,num_days), 10))

d = 0
diff = 10

while d < num_days:
    tmp_start = d
    tmp_end = min((d+diff), num_days)

    print tmp_start, '/', tmp_end

    print s.replace(days=+tmp_start).format('YYYY-MM-DD')
    print s.replace(days=+tmp_end).format('YYYY-MM-DD')


    d += diff