[Answered ]-I want to print time since on posts

you can use the timesince template tags
as per django docs
django documentation

{{post.created|timesince}}

for example

{% for post in posts %}
<div class="post-body-content">
@{{post.author}} - <small><i>{{post.created|timesince}} </i></small> <br>
Topic: <a href="{% url 'topic' post.Topic %}">{{post.Topic}}</a> <br>
<a href="{% url 'post' post.id %}">{{post}}</a> <br>