diff --git a/db/Calendar.py b/db/Calendar.py
index df001a5..1b93571 100644
--- a/db/Calendar.py
+++ b/db/Calendar.py
@@ -1,5 +1,5 @@
 import re
-from datetime import datetime, timezone
+from datetime import datetime, timezone, timedelta
 
 from discord import Embed
 from discord.ext.commands import Bot
@@ -8,7 +8,7 @@ import requests
 from sqlalchemy.orm import relationship, Session
 
 from db import Base
-from sqlalchemy import Column, Integer, String, BigInteger, ForeignKey
+from sqlalchemy import Column, Integer, String, BigInteger, ForeignKey, Text, DateTime
 
 name_re = re.compile(r"([A-Z]+ [A-Z]+)")
 
@@ -27,6 +27,8 @@ class Calendar(Base):
     resources = Column(Integer, nullable=False)
     project_id = Column(Integer, nullable=False)
     server = Column(BigInteger, nullable=False)
+    calendar = Column(Text)
+    calendar_update = Column(DateTime)
 
     calendars_notify = relationship("CalendarNotify", backref="calendar", lazy="subquery")
 
@@ -36,17 +38,24 @@ class Calendar(Base):
         self.project_id = project_id
         self.server = server
 
-    def cal(self, first_date: datetime, last_date: datetime) -> ics.Calendar:
-        return ics.Calendar(requests.get(url(self.resources, self.project_id, first_date, last_date)).text)
+    def cal(self) -> ics.Calendar:
+        now = datetime.now()
+        if not self.calendar or self.calendar_update <= now - timedelta(minutes=30):
+            first_date = now - timedelta(days=now.weekday())
+            last_date = now + timedelta(days=31)
+            self.calendar = requests.get(url(self.resources, self.project_id, first_date, last_date)).text
+            self.calendar_update = now
 
-    def events(self, first_date: datetime, last_date: datetime) -> [ics.Event]:
+        return ics.Calendar(self.calendar)
+
+    def events(self, first_date: datetime.date, last_date: datetime.date) -> [ics.Event]:
         events = []
-        for e in sorted(list(self.cal(first_date, last_date).events), key=lambda x: x.begin):
+        for e in sorted(list(self.cal().events), key=lambda x: x.begin):
             e.begin = e.begin.replace(tzinfo=timezone.utc).astimezone(tz=None)
             e.end = e.begin.replace(tzinfo=timezone.utc).astimezone(tz=None)
             e.organizer = name_re.findall(e.description)[0]
             events.append(e)
-        return events
+        return list(filter(lambda x: x.begin.date() >= first_date and x.end.date() <= last_date, events))
 
     async def notify(self, bot: Bot, event: ics.Event):
         for n in self.calendars_notify:
diff --git a/extensions/calendar.py b/extensions/calendar.py
index 410cb5e..788b286 100644
--- a/extensions/calendar.py
+++ b/extensions/calendar.py
@@ -118,16 +118,21 @@ class Calendar(commands.Cog):
     async def calendar_day(self, ctx: commands.Context, name: str, day: str = None):
         c = query_calendar(name, ctx.guild.id)
         if day is None:
-            date = datetime.now()
+            date = datetime.now().date()
         else:
             try:
-                date = datetime.strptime(day, "%d/%m/%Y")
+                date = datetime.strptime(day, "%d/%m/%Y").date()
             except ValueError:
                 raise BadArgument()
         embed = Embed(title=f"Day calendar: {c.name}", description=date.strftime("%d/%m/%Y"))
         for e in c.events(date, date):
             embed.add_field(name=f"{e.begin.strftime('%H:%M')} - {e.end.strftime('%H:%M')}",
                             value=f"{e.name} | {e.location} - {e.organizer}", inline=False)
+        s = db.Session()
+        if s.is_modified(c):
+            s.add(c)
+            s.commit()
+        s.close()
         await ctx.send(embed=embed)
 
     @calendar.group("week", pass_context=True)
@@ -135,10 +140,10 @@ class Calendar(commands.Cog):
     async def calendar_week(self, ctx: commands.Context, name: str, day: str = None):
         c = query_calendar(name, ctx.guild.id)
         if day is None:
-            date = datetime.now()
+            date = datetime.now().date()
         else:
             try:
-                date = datetime.strptime(day, "%d/%m/%Y")
+                date = datetime.strptime(day, "%d/%m/%Y").date()
             except ValueError:
                 raise BadArgument()
         date -= timedelta(days=date.weekday())
@@ -151,6 +156,11 @@ class Calendar(commands.Cog):
                               f"**{e.name}** | {e.location} - {e.organizer}")
             embed.add_field(name=date.strftime("%d/%m/%Y"), value="\n".join(events) or "Nothing !", inline=False)
             date = date + timedelta(days=1)
+        s = db.Session()
+        if s.is_modified(c):
+            s.add(c)
+            s.commit()
+        s.close()
         await ctx.send(embed=embed)
 
     @calendar.group("notify", pass_context=True)
@@ -231,9 +241,13 @@ class Calendar(commands.Cog):
         s = db.Session()
         now = datetime.now().replace(tzinfo=timezone.utc).astimezone(tz=None)
         for c in s.query(db.Calendar).all():
-            for e in c.events(now, now):
+            for e in c.events(now.date(), now.date()):
                 if xor(e.begin >= now - timedelta(minutes=30), e.begin >= now - timedelta(minutes=10)):
                     self.bot.loop.create_task(await c.notify(self.bot, e))
+            if s.is_modified(c):
+                s.add(c)
+                s.commit()
+        s.close()
 
     @commands.Cog.listener()
     async def on_command_error(self, ctx: commands.Context, error):