Django notification

Question

How to display notification before two days from start date and display notfication on end date using django?

from django.shortcuts import render
from app.models import maintenance


def notification(request):
    time_obj = maintenance.time_obj
    before_two_days = time_obj - datetime.timedelta(days=2)

    today = datetime.date.today()
    print('before_two_days',before_two_days)
    print('today',today)

    if before_two_days > today:
        msg = maintenance(start_date=maintenance.start_date,msg = f"Your site will be under construction on {before_two_days}",is_seen=False)
        msg.save()
    else:
        msg = maintenance(end_date=maintenance.end_date,msg = f"Your site will be reopen on {maintenance.end_date}",is_seen=False)
        msg.save()

    return render(request,'site.html')