django serializer 时间格式化

class ShareSerializer(serializers.ModelSerializer):
    class Meta:
        model = Share
        # fields = '__all__'
        exclude = ()

    def to_representation(self, instance):
        representation = super().to_representation(instance)
        representation['created_at'] = instance.created_at.strftime("%Y-%m-%d %H:%M:%S")
        representation['updated_at'] = instance.updated_at.strftime("%Y-%m-%d %H:%M:%S")
        return representation