django - Why this object is not showing in my template? -

i'm creating gantt chart , can see tasks in table - if task.end_date lower or equal last element of list of dates.

if higher django doesn't display specific task on table.

""" dates = [ datetime.date(2015, 8, 5), datetime.date(2015, 8, 6), datetime.date(2015, 8, 7), datetime.date(2015, 8, 8), datetime.date(2015, 8, 9), datetime.date(2015, 8, 10), datetime.date(2015, 8, 11), datetime.date(2015, 8, 12), datetime.date(2015, 8, 13), datetime.date(2015, 8, 14) ] """  {% date in dates %}     <td>     {% task in person.tasks %}         {% if task.start_date <= date , date <= task.end_date %} #if task.end_date higher datetime.date(2015, 8, 14) task won't show in table                 {{ task.task.name }}         {% endif %}     {% endfor %}     </td> {% endfor %}