[Answered ]-How to Set DateTimeFields in Django Models to None Value (If current time is greater than this fields with auto detect)

1👍

You can Override Save()

class Job(models.Model):
    def save(self, *args, **kwargs):
        if self.pin_till < now(): # Or what ever be the condition
        # Use your conditon and update 
           self.pin_till = None 
    super(Job, self).save(*args, **kwargs) #Save the modified value

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