How can I show elapsed time in Django - django

Question

So, I'm trying to show elapsed time on a page for recent-visited history. On my model, I have the following attribute.
models.py
class History(models.Model):
...
created_on = models.DateTimeField(auto_now_add=True)
...
I already checked the date documentation, but it doesn't have a way to represent elapsed time from creating time to now. Doesn't Django support the feature? then should I implement it on my own?

Answer 1

As far I know Django doesn't have such function. It's better to implement your own. With js for instance by using setInterval() and Ajax to update a specific time field.
Before that, you need to add a field to record when leaving the page.
created_on = models.DateTimeField(auto_now_add=True)
left_at = models.DateTimeField(auto_now_add=True)
Js
It's important that you have this script in your HTML page, since we'll use Django variables.
var id_obj = '{{ obj.id }}'; // $('tag').val();
totalSeconds = 5;
setInterval(function(){
recordElapsedTime();
},totalSeconds * 1000);
var recordElapsedTime = function(){
$.ajax({
url:"/url/to/view/",
type:"POST",
data:{
id_obj:id_obj,
csrfmiddlewaretoken:'{{ csrf_token }}'
},
});
}
View
import datetime
def elapsedTime(request):
if request.method == 'POST' and request.is_ajax():
id_obj = request.POST.get('id_obj')
obj = get_object_or_404(ObjectModel,id=id_obj)
obj.left_at = datetime.datetime.now()
obj.save()
Now it's pretty easy to determine the elapsed time, as a property method in Model for instance.
#property
def elapsed_time(self)
return (self.left_at - self.created_on).seconds