diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index fe1a05e..8a28934 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -13,12 +13,18 @@ module ApplicationHelper
     root = names.shift
 
     names.each do |n|
-      root += "[#{n}]"
+      root += '[' + n.to_s + ']'
     end
 
     [root, name]
   end
 
+  def plain_field_name_for(*names)
+    root, name = field_name_for(*names)
+
+    root + '[' + name.to_s + ']'
+  end
+
   def distance_of_time_in_words_if_more_than_a_minute(seconds)
     if seconds > 60
       distance_of_time_in_words seconds
@@ -62,13 +68,15 @@ module ApplicationHelper
 
   # Opciones por defecto para el campo de un formulario
   def field_options(attribute, metadata, **extra)
+    required = metadata.required || extra[:required]
+
     {
       class: "form-control #{invalid(metadata.post, attribute)} #{extra[:class]}",
-      required: metadata.required,
+      required: required,
       autofocus: (metadata.post.attributes.first == attribute),
       aria: {
         describedby: id_for_help(attribute),
-        required: metadata.required
+        required: required
       }
     }
   end
diff --git a/app/javascript/packs/application.js b/app/javascript/packs/application.js
index 9887a2a..f3e8bc0 100644
--- a/app/javascript/packs/application.js
+++ b/app/javascript/packs/application.js
@@ -30,7 +30,58 @@ import "prosemirror-menu/style/menu.css"
 import "prosemirror-view/style/prosemirror.css"
 import "prosemirror-example-setup/style/style.css"
 
+// Lista de equivalencias entre Date#getTimezoneOffset de JS y
+// MetadataEvent
+const timeZoneOffsets = {
+   '720': '-12:00',
+   '660': '-11:00',
+   '600': '-10:00',
+   '570': '-09:30',
+   '540': '-09:00',
+   '480': '-08:00',
+   '420': '-07:00',
+   '360': '-06:00',
+   '300': '-05:00',
+   '240': '-04:00',
+   '210': '-03:30',
+   '180': '-03:00',
+   '120': '-02:00',
+    '60': '-01:00',
+     '0': '00:00',
+   '-60': '+01:00',
+  '-120': '+02:00',
+  '-180': '+03:00',
+  '-210': '+03:30',
+  '-240': '+04:00',
+  '-270': '+04:30',
+  '-300': '+05:00',
+  '-330': '+05:30',
+  '-345': '+05:45',
+  '-360': '+06:00',
+  '-390': '+06:30',
+  '-420': '+07:00',
+  '-480': '+08:00',
+  '-525': '+08:45',
+  '-540': '+09:00',
+  '-570': '+09:30',
+  '-600': '+10:00',
+  '-630': '+10:30',
+  '-660': '+11:00',
+  '-720': '+12:00',
+  '-765': '+12:45',
+  '-780': '+13:00',
+  '-840': '+14:00'
+};
+
+// Obtiene el huso horario local 
+const timeZoneOffset = timeZoneOffsets[(new Date).getTimezoneOffset().toString()];
+
 document.addEventListener('turbolinks:load', () => {
+
+  // Aplicar el huso horario descubierto en los campos de evento solo
+  // cuando estamos creando un artículo.
+  document.querySelectorAll('.new .event .zone select').forEach(zone => zone.value = timeZoneOffset);
+
   document.querySelectorAll('.markdown-content').forEach(mdc => {
     let textArea = mdc.querySelector(".content"),
         editor = mdc.querySelector(".editor");
diff --git a/app/models/metadata_event.rb b/app/models/metadata_event.rb
new file mode 100644
index 0000000..a458926
--- /dev/null
+++ b/app/models/metadata_event.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+# Gestiona eventos compatibles con jekyll-ical
+class MetadataEvent < MetadataTemplate
+  # Preferimos los husos horarios en números porque los husos con
+  # nombres dejan afuera territorios que comparten el mismo huso que
+  # otras ciudades más hegemónicas.
+  #
+  # @see {https://en.wikipedia.org/wiki/List_of_UTC_time_offsets}
+  TIMEZONES = %w[-12:00 -11:00 -10:00 -09:30 -09:00 -08:00 -07:00 -06:00
+                 -05:00 -04:00 -03:30 -03:00 -02:00 -01:00 00:00 +01:00 +02:00 +03:00
+                 +03:30 +04:00 +04:30 +05:00 +05:30 +05:45 +06:00 +06:30 +07:00 +08:00
+                 +08:45 +09:00 +09:30 +10:00 +10:30 +11:00 +12:00 +12:45 +13:00
+                 +14:00].freeze
+
+  # El valor por defecto es un Hash con algunas llaves pero queremos que
+  # sea opcional.
+  #
+  # @return [Hash]
+  def default_value
+    {}
+  end
+
+  def to_param
+    { name => {} }
+  end
+
+  # Dates are required and need to be parseable
+  def validate
+    self.errors = []
+    times = []
+
+    %w[dtstart dtend].each do |dt|
+      errors << I18n.t("metadata.#{type}.zone_missing") unless TIMEZONES.include? value.dig(dt, 'zone')
+      errors << I18n.t("metadata.#{type}.date_missing") if value.dig(dt, 'date').blank?
+
+      begin
+        Date.parse value.dig(dt, 'date')
+      rescue ArgumentError
+        errors << I18n.t("metadata.#{type}.date_non_parseable")
+      end
+
+      unless (time = value.dig(dt, 'time')).blank?
+        errors << I18n.t("metadata.#{type}.time_non_parseable") unless /[0-5][0-9]:[0-5][0-9]/ =~ time
+      end
+
+      times << value.dig(dt, 'date') + ' ' + value.dig(dt, 'time')
+    end
+
+    begin
+      dtstart, dtend = times.map { |t| Time.parse t }
+      errors << I18n.t("metadata.#{type}.end_in_the_past") if dtstart > dtend
+    rescue ArgumentError
+      errors << I18n.t("metadata.#{type}.time_non_parseable")
+    end
+
+    errors.empty?
+  end
+
+  def sanitize(hash)
+    self[:value] = %w[dtstart dtend].map do |dt|
+      time = hash.dig(dt, 'time')
+
+      {
+        dt => {
+          'zone' => hash.dig(dt, 'zone'),
+          'date' => Date.parse(hash.dig(dt, 'date')).to_s,
+          'time' => time.blank? ? '00:00' : time
+        }
+      }
+    end.inject(:merge)
+  end
+end
diff --git a/app/models/metadata_template.rb b/app/models/metadata_template.rb
index e6c0763..27cc3e7 100644
--- a/app/models/metadata_template.rb
+++ b/app/models/metadata_template.rb
@@ -22,9 +22,6 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
   end
 
   # Valor actual o por defecto
-  #
-  # XXX: No estamos sanitizando la entrada, cada tipo tiene que
-  # auto-sanitizarse.
   def value
     self[:value] || document.data.fetch(name.to_s, default_value)
   end
diff --git a/app/views/posts/_form.haml b/app/views/posts/_form.haml
index 12e814d..3d32529 100644
--- a/app/views/posts/_form.haml
+++ b/app/views/posts/_form.haml
@@ -8,15 +8,17 @@
   if post.new?
     url = site_posts_path(site, locale: @locale)
     method = :post
+    extra_class = 'new'
   else
     url = site_post_path(site, post.id, locale: @locale)
     method = :patch
+    extra_class = 'edit'
   end
 
 - dir = t("locales.#{@locale}.dir")
 
 -# Comienza el formulario
-= form_tag url, method: method, class: 'form post', multipart: true do
+= form_tag url, method: method, class: 'form post ' + extra_class, multipart: true do
 
   -# Botones de guardado
   = render 'posts/submit', site: site, post: post
diff --git a/app/views/posts/attribute_ro/_event.haml b/app/views/posts/attribute_ro/_event.haml
new file mode 100644
index 0000000..2348174
--- /dev/null
+++ b/app/views/posts/attribute_ro/_event.haml
@@ -0,0 +1,7 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td
+    %dl
+      - %i[dtstart dtend].each do |dt|
+        %dt= post_label_t(attribute, dt, post: post)
+        %dl= Time.parse %w[date time zone].map { |x| metadata.value[dt.to_s][x] }.join(' ')
diff --git a/app/views/posts/attributes/_event.haml b/app/views/posts/attributes/_event.haml
new file mode 100644
index 0000000..8ff9286
--- /dev/null
+++ b/app/views/posts/attributes/_event.haml
@@ -0,0 +1,32 @@
+-#
+  El evento tiene dos grupos, comienzo y final del evento, cada uno con
+  fecha, hora y zona horaria
+
+%fieldset.event
+  %legend= post_label_t(attribute, post: post)
+  = render 'posts/attribute_feedback',
+    post: post, attribute: attribute, metadata: metadata
+
+  - %i[dtstart dtend].each do |dt|
+    .row{ class: dt }
+      .col
+        .date.form-group
+          = label_tag "post_#{attribute}_#{dt}_date",
+            post_label_t(attribute, :date, post: post)
+          = date_field_tag(*field_name_for('post', attribute, dt, :date),
+            value: metadata.value.dig(dt.to_s, 'date'),
+            **field_options(attribute, metadata, required: true))
+      .col
+        .time.form-group
+          = label_tag "post_#{attribute}_#{dt}_time",
+            post_label_t(attribute, :time, post: post)
+          = time_field_tag(*field_name_for('post', attribute, dt, :time),
+            value: metadata.value.dig(dt.to_s, 'time'),
+            **field_options(attribute, metadata))
+      .col
+        .zone.form-group
+          = label_tag "post_#{attribute}_#{dt}_zone",
+            post_label_t(attribute, :zone, post: post)
+          = select_tag(plain_field_name_for('post', attribute, dt, :zone),
+            options_for_select(MetadataEvent::TIMEZONES, metadata.value.dig(dt.to_s, 'zone') || '00:00'),
+            **field_options(attribute, metadata))
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 1d3a086..f8add92 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -37,6 +37,12 @@ en:
       cant_be_empty: 'This field cannot be empty'
     image:
       cant_be_empty: 'This field cannot be empty'
+    event:
+      zone_missing: 'Timezone is incorrect'
+      date_missing: 'Event date is required'
+      date_non_parseable: 'Time is not in the correct format'
+      time_non_parseable: 'Date is not in the correct format'
+      end_in_the_past: "Event end can't happen before the start"
   exceptions:
     post:
       site_missing: 'Needs an instance of Site'
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 10c756d..e94d212 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -39,6 +39,12 @@ es:
       cant_be_empty: 'El campo no puede estar vacío'
       not_an_image: 'No es una imagen'
       path_required: 'Se necesita un archivo de imagen'
+    event:
+      zone_missing: 'El huso horario no es correcto'
+      date_missing: 'La fecha es obligatoria'
+      date_non_parseable: 'La fecha no está en el formato correcto'
+      time_non_parseable: 'La hora no está en el formato correcto'
+      end_in_the_past: 'El fin del evento no puede ser anterior al comienzo'
   exceptions:
     post:
       site_missing: 'Necesita una instancia de Site'
@@ -446,9 +452,13 @@ es:
     image:
       multiple: 'Puedes seleccionar varias imágenes usando la tecla <kbd>Ctrl</kbd> o <kbd>Cmd</kbd> en tu teclado.'
     url: 'La dirección debe comenzar con http:// o https://'
-    blank: En blanco
+    blank: Vacío
     destroy: Borrar
-    confirm_destroy: ¿Estás segurx?
+    confirm_destroy: ¿Estás segure?
+    form:
+      errors:
+        title: Hay errores en el formulario
+        help: Por favor, verifica que todos los valores sean correctos.
   usuaries:
     invite_as:
       usuaries: usuaries