diff --git a/src/services/worldStateService.ts b/src/services/worldStateService.ts
index d3527c6e..58247130 100644
--- a/src/services/worldStateService.ts
+++ b/src/services/worldStateService.ts
@@ -440,9 +440,9 @@ export const pushWeeklyActs = (
         const weekEnd = weekStart + unixTimesInMs.week;
         const nightwaveWeekStart = ((): number => {
             const nightwaveStartDate = new Date(nightwaveStartTimestamp);
-            const dayOffset = (nightwaveStartDate.getDay() + 6) % 7;
-            nightwaveStartDate.setDate(nightwaveStartDate.getDate() - dayOffset);
-            nightwaveStartDate.setHours(0, 0, 0, 0);
+            const dayOffset = (nightwaveStartDate.getUTCDay() + 6) % 7;
+            nightwaveStartDate.setUTCDate(nightwaveStartDate.getUTCDate() - dayOffset);
+            nightwaveStartDate.setUTCHours(0, 0, 0, 0);
             return nightwaveStartDate.getTime();
         })();
         const nightwaveWeek = Math.trunc((weekStart - nightwaveWeekStart) / unixTimesInMs.week);