Override date & time inputs more info: How to customize Form Rendering - http://symfony.com/doc/current/cookbook/form/form_customization.html

fields.html.twig

{# File path: YourBundle / Resources / views / Form / fields.html.twig #}
{% block form_widget_simple %}
    {% spaceless %}
        {% set type = type|default('text') in ['date','time'] ? 'text' : type|default('text') %}
        <input type="{{ type }}" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %}/>
    {% endspaceless %}
{% endblock form_widget_simple %}


{# How to use: #}
# 1 Apply on a single Twig
{% form_theme form 'MytechdeskBundle:Form:fields.html.twig' %}

# 2 Making Application-wide Customizations¶
# app/config/config.yml
twig:
    form:
        resources:
            - 'AcmeDemoBundle:Form:fields.html.twig'