Create An Automatic DateTimeField In Django

File: SITE_NAME/APP_NAME/models.py

from django.db import models

class Note(models.Model):
    note_text = models.CharField(max_length=200)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.note_text

Notes

auto_not_add=True sets the datetime when the object is first created
auto_now=True updates the datetime every time the object is saved with .save()
Note that auto_now=True won't update using approaches other than .save() (e.g. QuerySet.update() won't work)

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References

Django DateField Docs

Note that DateTimeField is below it but it makes references to options that are in the DateField.