From 45f1dff4e830d6594b2669d82c67a25263b693c8 Mon Sep 17 00:00:00 2001
From: ivarlovlie <git@ivarlovlie.no>
Date: Tue, 25 May 2021 01:10:36 +0200
Subject: Add StartOfWeek

---
 src/IOL.Helpers/DateTimeHelpers.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/IOL.Helpers/DateTimeHelpers.cs b/src/IOL.Helpers/DateTimeHelpers.cs
index 07e951e..98b3ee9 100644
--- a/src/IOL.Helpers/DateTimeHelpers.cs
+++ b/src/IOL.Helpers/DateTimeHelpers.cs
@@ -18,5 +18,10 @@ namespace IOL.Helpers
 		}
 
 		public static DateTime ToOsloTimeZone(this DateTime value) => ToTimeZoneId(value, "Europe/Oslo");
+
+		public static DateTime StartOfWeek(this DateTime dt, DayOfWeek startOfWeek) {
+			var diff = (7 + (dt.DayOfWeek - startOfWeek)) % 7;
+			return dt.AddDays(-1 * diff).Date;
+		}
 	}
-}
\ No newline at end of file
+}
-- 
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