diff --git a/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/create.ts b/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/create.ts
index 004922ae96..2a79c41085 100644
--- a/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/create.ts
@@ -108,14 +108,15 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			const now = new Date();
 			let expirationDate: Date | null = new Date();
 
+			const previousMonth = expirationDate.getUTCMonth();
 			(ps.expiresAt === '1hour' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 hour')); } :
 				ps.expiresAt === '12hours' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('12 hours')); } :
 				ps.expiresAt === '1day' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 day')); } :
 				ps.expiresAt === '1week' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 week')); } :
-				ps.expiresAt === '1month' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 1 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 1 + 1) / 12))); } : 
-				ps.expiresAt === '3months' ? function () {expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 3 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 3 + 1) / 12 ))); } :
-				ps.expiresAt === '6months' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 6 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 6 + 1) / 12))); } :
-				ps.expiresAt === '1year' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 year')); } : function () { expirationDate = null; })();
+				ps.expiresAt === '1month' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 1 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 1 + 1) / 12))); } :
+				ps.expiresAt === '3months' ? function () {expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 3 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 3 + 1) / 12))); } :
+				ps.expiresAt === '6months' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 6 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 6 + 1) / 12))); } :
+				ps.expiresAt === '1year' ? function () { expirationDate!.setUTCFullYear(expirationDate!.getFullYear() + 1); } : function () { expirationDate = null; })();
 
 			return await this.abuseReportResolverRepository.insert({
 				id: this.idService.genId(),
diff --git a/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/update.ts b/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/update.ts
index 2797f851f8..3c433ecf6c 100644
--- a/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/abuse-report-resolver/update.ts
@@ -94,14 +94,15 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			if (ps.forward) properties.forward = ps.forward;
 			if (ps.expiresAt) {
 				let expirationDate: Date | null = new Date();
+				const previousMonth = expirationDate.getUTCMonth();
 				(ps.expiresAt === '1hour' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 hour')); } :
 					ps.expiresAt === '12hours' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('12 hours')); } :
 					ps.expiresAt === '1day' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 day')); } :
 					ps.expiresAt === '1week' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 week')); } :
-					ps.expiresAt === '1month' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 1 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 1 + 1) / 12))); } : 
-					ps.expiresAt === '3months' ? function () {expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 3 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 3 + 1) / 12))); } :
-					ps.expiresAt === '6months' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 6 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((expirationDate!.getUTCMonth() + 6 + 1) / 12))); } :
-					ps.expiresAt === '1year' ? function () { expirationDate!.setTime(expirationDate!.getTime() + ms('1 year')); } : function () { expirationDate = null; })();
+					ps.expiresAt === '1month' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 1 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 1 + 1) / 12))); } :
+					ps.expiresAt === '3months' ? function () {expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 3 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 3 + 1) / 12))); } :
+					ps.expiresAt === '6months' ? function () { expirationDate!.setUTCMonth((expirationDate!.getUTCMonth() + 6 + 1) % 12 - 1); expirationDate!.setUTCFullYear(expirationDate!.getUTCFullYear() + (Math.floor((previousMonth + 6 + 1) / 12))); } :
+					ps.expiresAt === '1year' ? function () { expirationDate!.setUTCFullYear(expirationDate!.getFullYear() + 1); } : function () { expirationDate = null; })();
 
 				properties.expiresAt = ps.expiresAt;
 				properties.expirationDate = expirationDate;
diff --git a/packages/frontend/src/components/MkAbuseReportResolver.vue b/packages/frontend/src/components/MkAbuseReportResolver.vue
index a3a50b2ea0..96c7d635cf 100644
--- a/packages/frontend/src/components/MkAbuseReportResolver.vue
+++ b/packages/frontend/src/components/MkAbuseReportResolver.vue
@@ -16,7 +16,7 @@
 		<PrismEditor v-model="value.reportContentPattern" class="_code code" :class="$style.highlight" :highlight="highlighter" :lineNumbers="false" :readonly="!props.editable"/>
 	</div>
 	<MkSelect v-model="value.expiresAt" :disabled="!props.editable">
-		<template #label>{{ i18n.ts._abuse._resolver.expiresAt }}<span v-if="expirationDate" style="float: right;">{{ expirationDate }}</span></template>
+		<template #label>{{ i18n.ts._abuse._resolver.expiresAt }}<span v-if="expirationDate" style="float: right;"><MkDate :time="expirationDate" mode="absolute">{{ expirationDate }}</MkDate></span></template>
 		<option value="1hour">{{ i18n.ts._abuse._resolver['1hour'] }}</option>
 		<option value="12hours">{{ i18n.ts._abuse._resolver['12hours'] }}</option>
 		<option value="1day">{{ i18n.ts._abuse._resolver['1day'] }}</option>
@@ -70,7 +70,7 @@ const props = defineProps<{
 		previousExpiresAt?: string;
 	}
 }>();
-let expirationDate: string | null = $ref(null);
+let expirationDate: Date | null = $ref(null);
 
 type NonNullType<T> = {
 	[P in keyof T]: NonNullable<T[P]>
@@ -113,7 +113,7 @@ function highlighter(code) {
 
 function renderExpirationDate(empty = false) {
 	if (value.value.expirationDate && !empty) {
-		expirationDate = new Date(value.value.expirationDate).toLocaleString();
+		expirationDate = new Date(value.value.expirationDate);
 	} else {
 		expirationDate = null;
 	}