diff --git a/src/shared/utils/time-utils/get-node-reset-days/get-node-reset-days.util.ts b/src/shared/utils/time-utils/get-node-reset-days/get-node-reset-days.util.ts
index 60817b47..62386ab9 100644
--- a/src/shared/utils/time-utils/get-node-reset-days/get-node-reset-days.util.ts
+++ b/src/shared/utils/time-utils/get-node-reset-days/get-node-reset-days.util.ts
@@ -4,14 +4,13 @@ import dayjs from 'dayjs'
 
 export function getNodeResetDaysUtil(targetDay: number): number {
     const today = dayjs()
+    const nextMonth = today.add(1, 'month')
 
-    const targetThisMonth = today.date(targetDay)
-    const targetNextMonth = today.add(1, 'month').date(targetDay)
-
-    const correctedThisMonth = targetThisMonth.isValid() ? targetThisMonth : today.endOf('month')
-    const correctedNextMonth = targetNextMonth.isValid()
-        ? targetNextMonth
-        : today.add(1, 'month').endOf('month')
+    // dayjs silently rolls overflowing days into the next month (e.g. Feb 30 ->
+    // Mar 2) and keeps `isValid()` truthy, so clamp the target day to the number
+    // of days in the respective month to land on the last day instead.
+    const correctedThisMonth = today.date(Math.min(targetDay, today.daysInMonth()))
+    const correctedNextMonth = nextMonth.date(Math.min(targetDay, nextMonth.daysInMonth()))
 
     const daysToThisMonth = correctedThisMonth.diff(today, 'day')
     const daysToNextMonth = correctedNextMonth.diff(today, 'day')
@@ -28,15 +27,21 @@ export function getNodeResetDaysUtil(targetDay: number): number {
 
 export function getNodeResetPeriodUtil(targetDay: number): string {
     const today = dayjs()
+    const prevMonth = today.subtract(1, 'month')
+    const nextMonth = today.add(1, 'month')
 
-    const targetThisMonth = today.date(targetDay)
-    const correctedThisMonth = targetThisMonth.isValid() ? targetThisMonth : today.endOf('month')
+    // Clamp the target day independently for each month, otherwise deriving the
+    // previous/next reset date by adding or subtracting a month can land on the
+    // wrong day when the adjacent month has a different number of days.
+    const correctedPrevMonth = prevMonth.date(Math.min(targetDay, prevMonth.daysInMonth()))
+    const correctedThisMonth = today.date(Math.min(targetDay, today.daysInMonth()))
+    const correctedNextMonth = nextMonth.date(Math.min(targetDay, nextMonth.daysInMonth()))
 
     const isPastTargetDay = today.date() > targetDay
 
-    const startDate = isPastTargetDay ? correctedThisMonth : correctedThisMonth.subtract(1, 'month')
+    const startDate = isPastTargetDay ? correctedThisMonth : correctedPrevMonth
 
-    const endDate = isPastTargetDay ? correctedThisMonth.add(1, 'month') : correctedThisMonth
+    const endDate = isPastTargetDay ? correctedNextMonth : correctedThisMonth
 
     return `${startDate.format('D MMMM')} – ${endDate.format('D MMMM')}`
 }