Store time stamps to database - django

Question

I am creating a Django web based application for freelancers ,that they would be paid for number of hours they have worked on a project and also a weekly report is to be generated for weekly work and for that i need to work with time stamps so how do i implement it?
I want to create a button of start timer and stop timer, which records the time stamps of start timer and end timer?
I have a User model which is extended to Freelancer and person who hires Freelancer. How do i implement this?
Where do i edit the model of time stamps?
I have this model
from django.db import models
from django.contrib.auth.models import AbstractUser
class User(AbstractUser):
is_freelancer = models.BooleanField('Freelancer status', default=False)
is_hirer = models.BooleanField('Hirer status', default=False)
class Freelancer(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
hourly_rate = models.PositiveIntegerField(default=10)
education = models.TextField(default='asia')
professional_bio = models.TextField(blank=True, null=True)
professional_title = models.TextField(blank=True, null=True)
location = models.CharField(max_length=10, blank=True, null=True)
Address = models.CharField(max_length=100, blank=True, null=True)
city = models.CharField(max_length=100, blank=True, null=True)
postal_code = models.PositiveIntegerField(blank=True, null=True)
country = models.CharField(max_length=100, blank=True, null=True)
class Hirer(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
hourly_budget = models.PositiveIntegerField(blank=True, null=True)
project_title = models.CharField(max_length=100, default='hi')
project_description = models.TextField(blank=True, null=True)
job_category = models.CharField(max_length=100)
professional_bio = models.TextField(blank=True, null=True)
professional_title = models.TextField(blank=True, null=True)
location = models.CharField(max_length=10, blank=True, null=True)
Address = models.CharField(max_length=100, blank=True, null=True)
city = models.CharField(max_length=100, blank=True, null=True)
postal_code = models.PositiveIntegerField(blank=True, null=True)
country = models.CharField(max_length=100, blank=True, null=True)

Answer 1

This question is a bit broad, and I'm not really sure what it has to do with timestamps. But you might think about an "TimeWorked" model with foreign keys to both hirer and freelancer:
class TimeWorked(models.Model):
hirer = models.ForeignKey('Hirer', on_delete=models.CASCADE)
freelancer = models.ForeignKey('Freelancer', on_delete=models.CASCADE)
rate = models.IntegerField()
start_time = models.DateTimeField(auto_now_add=True)
end_time = models.DateTimeField(null=True, blank=True)
so you can create an instance of this class at the start of a block of time, then at the end fill in the end_time; then you can easily query the total amount of time worked for a job, and calculate the total to bill.
(Note you might want to rethink your models a bit, especially separating the project details from the hirer, otherwise each hirer can only ever create a single project.)