Show notifications to users at certain times in Django

Question

By creating a model on Django, I want to create notifications for my users on the hours and days I want. And I want to create these notifications from my admin panel.I want to set the start and end dates from the admin panel and send these notifications to the users within the specified time.And once the user sees it, I don't want it to see it again.An example notification model:

class NotificationModel(models.Model):
    title       = models.CharField(max_length=100)
    description = models.TextField()
    start_date  = models.DateTimeField()
    end_date    = models.DateTimeField()

How can I do that? How I use it will be healthier?