WIP: ilias-crawler: Demangle dates

PFERD/ilias/date_demangler.py

@@ -0,0 +1,24 @@
+"""
+Helper methods to demangle an ILIAS date.
+"""
+
+import datetime
+import re
+
+
+def demangle_date(date: str) -> datetime.datetime:
+    """
+    Demangle a given date in one of the following formats:
+    "Gestern, HH:MM"
+    "Heute, HH:MM"
+    "dd. mon.yyyy, HH:MM
+    """
+    date = re.sub(r"\s+", " ", date)
+    date = date.replace("Gestern", _yesterday().strftime("%d. %b %Y"))
+    date = date.replace("Heute", datetime.date.today().strftime("%d. %b %Y"))
+
+    return datetime.datetime.strptime(date, "%d. %b %Y, %H:%M")
+
+
+def _yesterday() -> datetime.date:
+    return datetime.date.today() - datetime.timedelta(days=1)