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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- Formulario -->
<form action="#" method="post">
  <h2>Ejemplo Pikaday en formato español</h2>
  <label for="fecha">Fecha</label>
  <!-- Campo que contendrá la fecha en formato calendario -->
  <input type="text" name="fecha" id="fecha" value="" />
  <p>Pulsa sobre la caja superior, te aparecerá el calendario para escoger el día. Verás que rellenará con la fecha en formato español.</p>
</form>
!

CSS 

              
                form { padding: 10px; }
label { font-weight: bold; }
input { padding: 5px; }
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JS 

              
                // Son necesarios cargar los Javascript de momnet.min.js y pikaday.min.js
// Importante, el moment.min.js antes que el pikaday.min.js (si no, no funcionará.)
var picker = new Pikaday({
  // Asignamos al input el pikaday
  field: document.getElementById('fecha'),
  // Vamos a personalizarlo al español
  i18n: {
    previousMonth : 'Anterior',
    nextMonth     : 'Siguiente',
    months        : ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre',' Diciembre'],
weekdays      : ['Domingo','Lunes','Martes','Miércoles','Jueves','Viernes','Sábado'],
weekdaysShort : ['Dom','Lun','Mar','Mie','Jue','Vie','Sáb']
        },
// Formato de la fecha
format: 'DD/MM/YYYY'
});
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999px

Console