I want to change the time calculation format (django models, virtual field)

Question

model field code is this

    created = models.DateTimeField(auto_now=True)


    @property
    def now_diff(self):
        return timezone.now() - self.created

I have a question about django time circulation using virtual field

current output of time circulation is 5:26:34.349728

But I want to 5:26:34

Is there a way?

thanks for let me know ~!

i chaged to

    @property
    def now_diff(self):
        s=timezone.now() - self.created
        hours, remainder = divmod(s, 3600)
        minutes, seconds = divmod(remainder, 60)
        return '{:02}:{:02}:{:02}'.format(int(hours), int(minutes), int(seconds))

but error

TypeError: 'Todo' object is not subscriptable

TypeError: unsupported operand type(s) for divmod(): 'datetime.timedelta' and 'int'

Answer 1

Subtract the microseconds from timedelta which you've got

from datetime import timedelta


class MyModel(models.Model):
    ...
    created = models.DateTimeField(auto_now=True)

    @property
    def now_diff(self):
        delta = timezone.now() - self.created
        return str(delta - timedelta(microseconds=delta.microseconds))

---

For more readable solution,

from datetime import timedelta


def chop_microseconds(delta):
    return delta - timedelta(microseconds=delta.microseconds)

class MyModel(models.Model):
    ...
    created = models.DateTimeField(auto_now=True)

    @property
    def now_diff(self):
        return str(chop_microseconds(timezone.now() - self.created))

---

Some BG things

If we look into the Source code of __str__() function of timedelta class,

....
if self._microseconds:
    s = s + ".%06d" % self._microseconds
...

which converts the string representation of the timedelta object.
So, here we substract the microsecond from timedelta and hence solved the problem :)

Answer 2

Maybe you can try like this(mostly copy pasted from this answer):

@property
def now_diff(self):
    time_delta = timezone.now() - self.created
    s = time_delta.seconds
    hours, remainder = divmod(s, 3600)
    minutes, seconds = divmod(remainder, 60)
    return '{:02}:{:02}:{:02}'.format(int(hours), int(minutes), int(seconds))