Add past and future validators for Date and DateTime fields

[Jasurbek Yuldoshev]

I often see that validating date fields is quite repetitive, for example like this:

def validate_expiration_date(self, value: date) -> date:
        if value <= timezone.now().date():
            raise serializers.ValidationError("Expiration Date must be in future")

        return value

I thought maybe it would be good to have such validation rules out of the box of Django, such as FutureDateValidator(), PastDateValidator().

[Natalia Bidart]

Hello Jasurbek Yuldoshev, thank you for taking the time to create this ticket.

A very similar idea has been presented and rejected a while ago in ​this email thread.

Given the above:

• If you are still keen to push this idea forward, the recommended path is to propose and re-discuss the request with the community and gain consensus. To do that, please consider starting a new conversation on the ​Django Forum, where you'll reach a wider audience and likely get extra feedback. Please reference the past conversation that I linked to provide a complete background for the conversation.
• I'll close the ticket for now, but if there is a community agreement for this feature request, you are welcome to come back to the ticket and point to the forum topic, so we can then re-open it. For more details, please see ​the documented guidelines for requesting features.

[Natalia Bidart]

Forum discussion (no strong consensus, actually the opposite): ​https://forum.djangoproject.com/t/futuredatetime-and-pastdatetime-validators/40553