decide.nolog.cz/app/validators/time.js

import BaseValidator from 'ember-cp-validations/validators/base';
import Ember from 'ember';
import moment from 'moment';

export default BaseValidator.extend({
  validate(value, options) {
    let valid;

    if (typeof options !== 'object') {
      options = {};
    }

    options.value = value;

    if (!Ember.isEmpty(value) && typeof value.trim === 'function') {
      value = value.trim();
    }

    valid = moment(value, 'H:mm', true).isValid();

    if (valid && value !== '24:00') {
      return true;
    } else {
      return this.createErrorMessage('time', value, options);
    }
  }
});