diff --git a/src/services/timePeriod.service.ts b/src/services/timePeriod.service.ts
index 99e139f3c4aee5532b0cab24a44cc1720705e3dd..4765a787c91f353db6d955bbbcbb7e4cf470389f 100644
--- a/src/services/timePeriod.service.ts
+++ b/src/services/timePeriod.service.ts
@@ -164,7 +164,7 @@ export default class TimePeriodService {
           keepLocalTime: true,
         })
       case TimeStep.WEEK:
-        return DateTime.local(startDate.year, startDate.month, 1)
+        return DateTime.local(startDate.year, startDate.month, startDate.day)
           .setZone('utc', {
             keepLocalTime: true,
           })