generating unique id from datetime field in order to implement infinite scroll

gistfile1.py

import time

from django.db import models


class MyModel(models.Model):
  # other fields...

  start_date = models.DateTimeField()
  unique_date = models.CharField(max_length=32, unique=True)  

  def save(self, **kwargs):
    str_timestamp = str(long(time.time() * 1000))
    str_start_date = self.start_date.strftime('%Y%m%d%H%M%S')
    self.unique_date = '%s_%s' % (str_start_date, str_timestamp)
    super(MyModel, self).save(**kwargs)

thanks @francofuji