Date as a percentage for the progress bar

Question

Good afternoon. Help me please. There is a project on Django. The project has a code from bootstrap4 - progress-bar, I need this progress bar, but I can't understand how to implement its performance, since it has data stored in percent, but I don't have percent, but the project date, that is, there is a beginning Let's say the project is 01 02 2000 and the end of the project 01 02 2002 there are 730 days difference between them. Here's how I turn these 730 days into 100%, and the remainder - let's say 140 days, also turn into percent.

HTML Template

<div class="progress">
  <div class="progress-bar bg-success" role="progressbar" style="width: 10%" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100"></div>
</div>

Python Template

prjauth = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, verbose_name="")
    prjtitle = models.CharField(max_length=200, verbose_name="")
    prjdesc = models.TextField(verbose_name="")
    prjfiles = models.FileField(upload_to='files_project', verbose_name="")
    prjdatestart = models.DateTimeField(default=timezone.now, verbose_name="")
    prjdateend = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjproekts = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjproekte = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjdatesnabs = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjdatesnabe = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjdatelines = models.DateTimeField(blank=True, null=True, verbose_name="")
    prjdatelinee = models.DateTimeField(blank=True, null=True, verbose_name="")

Answer 1

You can add a method to your model which can return the date progress:

Class MyModel(models.Model):
    # fields

    def get_progress(self):
        return timezone.now().date - self.start_date / self.end_date - self.start_date

The method can be called in your template:

aria-valuenow="{{ mymodel.get_progress }}"

Lastly, I would suggest removing the prj prefix on your model fields as it makes it hard to read - presumably your model is already called something like Project - it would therefore be easier to read project.start_date than project.prjstart_date .