diff --git a/biscuit/apps/chronos/util.py b/biscuit/apps/chronos/util.py
index 5c250f751361696f70547016b44fd0ef1c3b101d..710d79491c5103b2dd8e42a95ab89f421d6d1a5f 100644
--- a/biscuit/apps/chronos/util.py
+++ b/biscuit/apps/chronos/util.py
@@ -20,7 +20,7 @@ class CalendarWeek:
     def from_date(cls, when: date):
         """ Get the calendar week by a date object (the week this date is in). """
 
-        return cls(year=when.strftime('%Y'), week=when.strftime('%V'))
+        return cls(year=when.year, week=int(when.strftime('%V')))
 
     def __post_init__(self) -> None:
         today = date.today()