DateComponent.vue

<template>
    <fieldset class="app-border">
        <div class="form-group col-xs-2 col-md-2">
            <label for="initDate" class="control-label">Date Field</label>
            <datePicker
                v-model="initDate"
                language="en"
                id="initDate"
                format="dd/MM/yyyy"
                name="initDate"
                v-validate="'required'"
                :class="{'has-errors': errors.has('initDate')}"
            >
            </datePicker>
            <FormError :attribute_name="'initDate'" :errors_form="errors"> </FormError>
        </div>  
    </fieldset>
</template>

<script>
    import DatePicker from 'vuejs-datepicker';
    import FormError from '../FormError';
    export default {
        name: "my-date-component",
        inject: ['$validator'], //esta es la clave
        components: {
            DatePicker, FormError
        }
    }
</script>