from datetime import date
from datetime import timedelta
def norm2dqn(year, month, day):
dqnday = date(1993, 8, 31)
norm = date(year, month, day)
return (norm - dqnday).days
def dqn2norm(day):
dqnday = date(1993, 8, 31)
norm = dqnday + timedelta(days=day)
return norm
print(norm2dqn(2021, 6, 9))
print(dqn2norm(10123))