feature: flag for `@IsDateString()` decorator to validate date without time

It`s more feature request. I think it would be nice to have ability validate date string without time using @IsDateString() decorator. For example, ‘2000-07-26’, not ‘2000-07-26T00:00:01.967Z’. Cannot find how to do that not using @Matches() decorator.

[ghost]

I create custom one.

import { registerDecorator, ValidationOptions } from 'class-validator';

export function IsOnlyDate(validationOptions?: ValidationOptions) {
  return function(object: Object, propertyName: string) {
    registerDecorator({
      name: 'IsOnlyDate',
      target: object.constructor,
      propertyName: propertyName,
      constraints: [],
      options: {
        message: 'Please provide only date like 2020-12-08',
        ...validationOptions,
      },
      validator: {
        validate(value: any) {
          const regex = /([12]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01]))/;
          return typeof value === 'string' && regex.test(value);
        },
      },
    });
  };
}

[RomanSolianik]

@talski of course we can use regular expressions… basically we can use them for all validations, but I think the point of the creation of this library was to simplify this process