[Python] How to convert a datetime to period

How can I format a datetime in html from flask render_template? I am getting cabinet table from flask_sqlalchemy where the date is formatted 2025-06-25 10:55:15.500207. I just need the duration of the datetime till now. Example 1day ago or 2hours, 30mins ago or 50 minutes ago.

this is my try

HTML:

<p><span class="writeUp">{{Chat.chat}}</span>
<small class="text_muted ms-2 mt-2 float-end">{{timeNow - Chat.datecreated}} ago</small></p>


i got this 1 day, 0:00:00

MY MODEL:

class Chats(db.Model):
id = db.Column(db.Integer, primary_key=True)
chatcategory = db.Column(db.Integer, db.ForeignKey('courses.id'))
userId = db.Column(db.Integer, db.ForeignKey('users.id'))
chat = db.Column(db.String(100000))
chattagged = db.Column(db.Integer, nullable=True)
admincomment = db.Column(db.String(1000), nullable=True)
datecreated= db.Column(db.DateTime, default=datetime.now)

def __init__(self, chatcategory, chat, userId):
self.chatcategory = chatcategory
self.userId = userId
self.chat = chat

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