diff --git a/maloja/malojatime.py b/maloja/malojatime.py
index a808d9b..9561fac 100644
--- a/maloja/malojatime.py
+++ b/maloja/malojatime.py
@@ -212,16 +212,17 @@ class MTRangeWeek(MTRangeSingular):
 	def __init__(self,year=None,week=None):
 
 		# do this so we can construct the week with overflow (eg 2020/-3)
-		thisisoyear_firstday = date.fromchrcalendar(year,1,1)
+		thisisoyear_firstday = date.fromisocalendar(year,1,1) + timedelta(days=malojaconfig['WEEK_OFFSET']-1)
 		self.firstday = thisisoyear_firstday + timedelta(days=7*(week-1))
 		self.firstday = date(self.firstday.year,self.firstday.month,self.firstday.day)
 		# for compatibility with pre python3.8 (https://bugs.python.org/issue32417)
 
-
 		self.lastday = self.firstday + timedelta(days=6)
 
 		# now get the actual year and week number (in case of overflow)
-		self.year,self.week,_ = self.firstday.chrcalendar()
+		fakedate = self.firstday - timedelta(days=malojaconfig['WEEK_OFFSET']-1)
+		# fake date that gives the correct iso return for the real date considering our week offset
+		self.year,self.week,_ = fakedate.isocalendar()
 
 
 
@@ -359,7 +360,9 @@ def today():
 def thisweek():
 	tod = datetime.now(tz=TIMEZONE)
 	tod = date(tod.year,tod.month,tod.day)
-	y,w,_ = tod.chrcalendar()
+	fakedate = tod - timedelta(days=malojaconfig['WEEK_OFFSET']-1)
+	# fake date for correct iso representation
+	y,w,_ = fakedate.isocalendar()
 	return MTRangeWeek(y,w)
 def thismonth():
 	tod = datetime.now(tz=TIMEZONE)
@@ -564,7 +567,9 @@ def year_from_timestamp(stamp):
 def week_from_timestamp(stamp):
 	dt = datetime.fromtimestamp(stamp,tz=TIMEZONE)
 	d = date(dt.year,dt.month,dt.day)
-	y,w,_ = d.chrcalendar()
+	fakedate = d - timedelta(days=malojaconfig['WEEK_OFFSET']-1)
+	# fake date for correct iso representation
+	y,w,_ = fakedate.isocalendar()
 	return MTRangeWeek(y,w)
 
 def from_timestamp(stamp,unit):
diff --git a/maloja/pkg_global/conf.py b/maloja/pkg_global/conf.py
index d7f2a66..36a6566 100644
--- a/maloja/pkg_global/conf.py
+++ b/maloja/pkg_global/conf.py
@@ -189,7 +189,8 @@ malojaconfig = Configuration(
 			"delimiters_informal":(tp.Set(tp.String()),							"Informal Delimiters",			["vs.","vs","&"],																			"Delimiters in informal artist strings with spaces expected around them"),
 			"delimiters_formal":(tp.Set(tp.String()),							"Formal Delimiters",			[";","/","|","␝","␞","␟"],																	"Delimiters used to tag multiple artists when only one tag field is available"),
 			"filters_remix":(tp.Set(tp.String()),								"Remix Filters",				["Remix", "Remix Edit", "Short Mix", "Extended Mix", "Soundtrack Version"],					"Filters used to recognize the remix artists in the title"),
-			"parse_remix_artists":(tp.Boolean(),								"Parse Remix Artists",			False)
+			"parse_remix_artists":(tp.Boolean(),								"Parse Remix Artists",			False),
+			"week_offset":(tp.Integer(),										"Week Begin Offset",			0,																							"Start of the week for the purpose of weekly statistics. 0 = Sunday, 6 = Saturday")
 		},
 		"Web Interface":{
 			"default_range_startpage":(tp.Choice({'alltime':'All Time','year':'Year','month':"Month",'week':'Week'}),	"Default Range for Startpage Stats",	"year"),
diff --git a/maloja/pkg_global/monkey.py b/maloja/pkg_global/monkey.py
index 78a68b4..358b2c2 100644
--- a/maloja/pkg_global/monkey.py
+++ b/maloja/pkg_global/monkey.py
@@ -28,40 +28,3 @@ try:
 except Exception:
 	pass
 
-
-
-
-# proper sunday-first weeks
-# damn iso heathens
-
-from datetime import date, timedelta
-import datetime
-
-class expandeddate(date):
-
-	def chrweekday(self):
-		return self.isoweekday() + 1 % 7
-
-	def chrcalendar(self):
-		tomorrow = self + timedelta(days=1)
-		cal = tomorrow.isocalendar()
-		return (cal[0],cal[1],cal[2])
-
-	@classmethod
-	def fromchrcalendar(cls,y,w,d):
-		try:
-			return datetime.date.fromisocalendar(y,w,d) - timedelta(days=1) #sunday instead of monday
-		except Exception:
-			# pre python3.8 compatibility
-
-			firstdayofyear = datetime.date(y,1,1)
-			wkday = firstdayofyear.isoweekday()
-			if wkday <= 4: # day up to thursday -> this week belongs to the new year
-				firstisodayofyear = firstdayofyear - timedelta(days=wkday) #this also shifts to sunday-first weeks
-			else: # if not, still old year
-				firstisodayofyear = firstdayofyear + timedelta(days=7-wkday) #same
-			return firstisodayofyear + timedelta(days=(w-1)*7) + timedelta(days=d-1)
-
-
-
-datetime.date = expandeddate