diff --git a/src/weekUtils.ts b/src/weekUtils.ts
index 7775ef1..195ab40 100644
--- a/src/weekUtils.ts
+++ b/src/weekUtils.ts
@@ -1,32 +1,6 @@
-export const getStartOfWeek = (date: Date) => {
-    const startOfWeek = new Date(date);
-    const diffDays = startOfWeek.getDay();
-    startOfWeek.setDate(startOfWeek.getDate() - diffDays);
-    startOfWeek.setHours(0, 0, 0, 0);
-    return startOfWeek;
-};
-
-const areDatesInSameWeek = (date1: Date, date2: Date) => {
-    const startOfWeek1 = getStartOfWeek(date1);
-    const startOfWeek2 = getStartOfWeek(date2);
-    return startOfWeek1.getTime() === startOfWeek2.getTime();
-};
-
-export const getWeekNumber = (date: Date): number => {
-    const jan1st = new Date(date.getFullYear(), 0, 1);
-    const daysFromJan1UntilDate = Math.floor((date.getTime() - jan1st.getTime()) / (24 * 60 * 60 * 1000));
-    const offsetFromJan1ToSundaySameWeek = -(jan1st.getDay() % 7) % 7;
-    const weeksRaw = (daysFromJan1UntilDate + offsetFromJan1ToSundaySameWeek) / 7;
-
-    const weekOfDate =
-        (weeksRaw >= 0 ? Math.floor(weeksRaw) : Math.ceil(weeksRaw)) + (daysFromJan1UntilDate !== 365 ? 1 : 0);
-
-    const lastDayOfPreviousYear = new Date(date.getFullYear() - 1, 11, 31);
-
-    if (weekOfDate === 1 && areDatesInSameWeek(lastDayOfPreviousYear, date))
-        return getWeekNumber(lastDayOfPreviousYear);
-
-    return weekOfDate;
+export const getWeekNumber = (date: Date) => {
+    const onejan = new Date(date.getFullYear(), 0, 1);
+    return Math.ceil(((date.getTime() - onejan.getTime()) / 86400000 + onejan.getDay() + 1) / 7);
 };
 
 export const getWeekOfYear = (): number => getWeekNumber(new Date());
diff --git a/test/weekUtils.spec.ts b/test/weekUtils.spec.ts
index f9eec46..b86f5e8 100644
--- a/test/weekUtils.spec.ts
+++ b/test/weekUtils.spec.ts
@@ -7,7 +7,7 @@ describe('weekUtils', () => {
             expect(getWeekNumber(date1)).toBe(53);
 
             const date2 = new Date('2025-01-01');
-            expect(getWeekNumber(date2)).toBe(52);
+            expect(getWeekNumber(date2)).toBe(53);
         });
     });