Fix #37 -- Clever displaying of date ranges

src/pretix/helpers/daterange.py

@@ -0,0 +1,21 @@
+from django.template.defaultfilters import date as _date
+from django.utils.translation import get_language, ugettext_lazy as _
+
+
+def daterange(df, dt):
+    lng = get_language()
+
+    if lng.startswith("de"):
+        if df.year == dt.year and df.month == dt.month:
+            return "{}.–{}".format(_date(df, "j"), _date(dt, "j. F Y"))
+        elif df.year == dt.year:
+            return "{} – {}".format(_date(df, "j. F"), _date(dt, "j. F Y"))
+    elif lng.startswith("en"):
+        if df.year == dt.year and df.month == dt.month:
+            return "{} – {}".format(_date(df, "N jS"), _date(dt, "jS, Y"))
+        elif df.year == dt.year:
+            return "{} – {}".format(_date(df, "N jS"), _date(dt, "N jS, Y"))
+
+    return _("{date_from} – {date_to}").format(
+        date_from=_date(df, "DATE_FORMAT"), date_to=_date(dt, "DATE_FORMAT")
+    )