diff --git a/content/cfp.en.md b/content/cfp.en.md
index ba664f7..921a1a5 100644
--- a/content/cfp.en.md
+++ b/content/cfp.en.md
@@ -19,8 +19,8 @@ learn new stuff and have fun.
 ## When and Where is CoSin?
 
 This year's CoSin takes place from
-{{< cosin_i18n "date_start_weekday" >}}, {{< cosin_i18n "date_start_month" >}} {{< cosin "date_start_day" >}}th until
-{{< cosin_i18n "date_end_weekday" >}}, {{< cosin_i18n "date_end_month" >}} {{< cosin "date_end_day" >}}th
+{{< cosin_i18n "date_start_weekday" >}}, {{< cosin_i18n "date_start_month" >}} {{< cosin_humanize "date_start_day" >}} until
+{{< cosin_i18n "date_end_weekday" >}}, {{< cosin_i18n "date_end_month" >}} {{< cosin_humanize "date_end_day" >}}
 {{< cosin "date_year" >}}
 {{< cosin_i18n "location_name_preposition" >}} [{{< cosin_i18n "location_name" >}}]({{< cosin "location_url" >}}) in {{< cosin_i18n "location_city" >}}.
 
diff --git a/content/infos.en.md b/content/infos.en.md
index f7b1ec6..92caad7 100644
--- a/content/infos.en.md
+++ b/content/infos.en.md
@@ -10,8 +10,8 @@ menu:
 ## Date
 
 CoSin {{< cosin "date_year" >}} takes place from
-{{< cosin_i18n "date_start_weekday" >}}, {{< cosin_i18n "date_start_month" >}} {{< cosin "date_start_day" >}}th until
-{{< cosin_i18n "date_end_weekday" >}}, {{< cosin_i18n "date_end_month" >}} {{< cosin "date_end_day" >}}th
+{{< cosin_i18n "date_start_weekday" >}}, {{< cosin_i18n "date_start_month" >}} {{< cosin_humanize "date_start_day" >}} until
+{{< cosin_i18n "date_end_weekday" >}}, {{< cosin_i18n "date_end_month" >}} {{< cosin_humanize "date_end_day" >}}
 {{< cosin "date_year" >}}.
 
 ## Cost
diff --git a/layouts/shortcodes/cosin_humanize.html b/layouts/shortcodes/cosin_humanize.html
new file mode 100644
index 0000000..48720fa
--- /dev/null
+++ b/layouts/shortcodes/cosin_humanize.html
@@ -0,0 +1,2 @@
+{{ $value := index .Site.Data.cosin (.Get 0) }}
+{{- humanize $value -}}
diff --git a/themes/cosin-theme/layouts/partials/site-sidebar.en.html b/themes/cosin-theme/layouts/partials/site-sidebar.en.html
index 1af1509..bb2e83e 100644
--- a/themes/cosin-theme/layouts/partials/site-sidebar.en.html
+++ b/themes/cosin-theme/layouts/partials/site-sidebar.en.html
@@ -10,7 +10,7 @@
 
 <p>
   {{ if .date_known }}
-  <strong>Date:</strong> {{ i18n .date_start_month }} {{ .date_start_day }}th - {{ i18n .date_end_month }} {{ .date_end_day }}th {{ .date_year }}<br/>
+  <strong>Date:</strong> {{ i18n .date_start_month }} {{ humanize .date_start_day }} - {{ i18n .date_end_month }} {{ humanize .date_end_day }} {{ .date_year }}<br/>
   {{ end }}
 
   {{ if .location_known }}