fix(billing): compute plan expiry with Jalali months

Server/plugin/support charges used Gregorian Date#setMonth, so 3 months from 1405/06/01 became 1405/09/02. Now add N Jalali months minus one day (1405/08/30).

package-lock.json

@@ -21,6 +21,7 @@
         "bcrypt": "5.1.1",
         "class-transformer": "^0.5.1",
         "class-validator": "^0.14.2",
+        "jalaali-js": "^2.0.1",
         "mysql2": "^3.23.1",
         "passport": "^0.7.0",
         "passport-jwt": "^4.0.1",
@@ -35,6 +36,7 @@
         "@nestjs/testing": "^11.0.1",
         "@types/bcrypt": "5.0.2",
         "@types/express": "^5.0.0",
+        "@types/jalaali-js": "^1.2.0",
         "@types/jest": "^30.0.0",
         "@types/multer": "^2.2.0",
         "@types/node": "^22.0.0",
@@ -3007,6 +3009,13 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "node_modules/@types/jalaali-js": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmmirror.com/@types/jalaali-js/-/jalaali-js-1.2.0.tgz",
+      "integrity": "sha512-DRQKjbfFe0/v3siCou9eFzYjDxJItkJpxbU+/CSptvoRqq2/VmTA6y8QvqK/VELKW6xX3qb174nLZlrFV9OT3Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/jest": {
       "version": "30.0.0",
       "resolved": "https://registry.npmmirror.com/@types/jest/-/jest-30.0.0.tgz",
@@ -7058,6 +7067,15 @@
         "@pkgjs/parseargs": "^0.11.0"
       }
     },
+    "node_modules/jalaali-js": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmmirror.com/jalaali-js/-/jalaali-js-2.0.1.tgz",
+      "integrity": "sha512-qzTmjw6lZ3V4znyNA8ceYoGgFR+CcF+xEfIYZNcK2ZR0mzdMpMZ6iAcdRPvMgxUVdPMh6QLWCANpTcCJow2U+Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/jest": {
       "version": "30.4.2",
       "resolved": "https://registry.npmmirror.com/jest/-/jest-30.4.2.tgz",

package.json

@@ -57,6 +57,7 @@
     "bcrypt": "5.1.1",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.2",
+    "jalaali-js": "^2.0.1",
     "mysql2": "^3.23.1",
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",
@@ -71,6 +72,7 @@
     "@nestjs/testing": "^11.0.1",
     "@types/bcrypt": "5.0.2",
     "@types/express": "^5.0.0",
+    "@types/jalaali-js": "^1.2.0",
     "@types/jest": "^30.0.0",
     "@types/multer": "^2.2.0",
     "@types/node": "^22.0.0",

src/common/iran-time.util.ts

@@ -1,5 +1,7 @@
 /** Shared Iran timezone helpers for SuperAdmin API. */
 
+import { toGregorian, jalaaliMonthLength } from 'jalaali-js';
+
 export const IRAN_TZ = 'Asia/Tehran';
 
 /** Gregorian YYYY-MM-DD for the calendar day in Asia/Tehran. */
@@ -38,3 +40,71 @@ export function iranDaysUntil(expiresAt: Date, now: Date = new Date()): number {
   const end = Date.parse(`${iranYmd(expiresAt)}T12:00:00+03:30`);
   return Math.round((end - start) / 86_400_000);
 }
+
+export type IranJalaliYmd = { year: number; month: number; day: number };
+
+/** Jalali Y/M/D for a Date in Asia/Tehran. */
+export function iranJalaliParts(date: Date): IranJalaliYmd {
+  const parts = new Intl.DateTimeFormat('en-u-ca-persian', {
+    timeZone: IRAN_TZ,
+    year: 'numeric',
+    month: 'numeric',
+    day: 'numeric',
+  }).formatToParts(date);
+
+  const num = (type: Intl.DateTimeFormatPartTypes) => {
+    const raw = parts.find((p) => p.type === type)?.value ?? '';
+    const n = Number(raw);
+    if (!Number.isFinite(n)) {
+      throw new Error(`Cannot read Jalali ${type} from ${date.toISOString()}`);
+    }
+    return n;
+  };
+
+  return { year: num('year'), month: num('month'), day: num('day') };
+}
+
+/** Noon Iran (+03:30) for a Jalali calendar day. */
+export function iranDateFromJalali(year: number, month: number, day: number): Date {
+  const g = toGregorian(year, month, day);
+  const iso = `${pad2(g.gy)}-${pad2(g.gm)}-${pad2(g.gd)}T12:00:00+03:30`;
+  const d = new Date(iso);
+  if (Number.isNaN(d.getTime())) {
+    throw new Error(`Invalid Jalali date ${year}/${month}/${day}`);
+  }
+  return d;
+}
+
+/** Add calendar days on the Iran civil day (noon Tehran). */
+export function addIranDays(from: Date, days: number): Date {
+  const ymd = iranYmd(from);
+  const base = Date.parse(`${ymd}T12:00:00+03:30`);
+  return new Date(base + days * 86_400_000);
+}
+
+/**
+ * Add Jalali months (same day-of-month, clamped to month length).
+ * Example: 1405/06/01 + 3 → 1405/09/01.
+ */
+export function addIranMonths(from: Date, months: number): Date {
+  const { year, month, day } = iranJalaliParts(from);
+  const total = year * 12 + (month - 1) + months;
+  const nextYear = Math.floor(total / 12);
+  const nextMonth = (total % 12) + 1;
+  const maxDay = jalaaliMonthLength(nextYear, nextMonth);
+  const nextDay = Math.min(day, maxDay);
+  return iranDateFromJalali(nextYear, nextMonth, nextDay);
+}
+
+/**
+ * Plan expiry for server / plugin / support charges.
+ * Start day + N Jalali months, then minus 1 day (last inclusive day of the period).
+ * Example: 1405/06/01 + 3 months → expires 1405/08/30.
+ */
+export function addIranPlanExpiry(from: Date, months: number): Date {
+  return addIranDays(addIranMonths(from, months), -1);
+}
+
+function pad2(n: number) {
+  return String(n).padStart(2, '0');
+}

src/plugins/plugins.service.ts

@@ -11,6 +11,7 @@ import { PrismaService } from '../prisma/prisma.service';
 import { AuditService } from '../audit/audit.service';
 import { AdminNotifyService } from '../notifications/admin-notify.service';
 import {
+  addIranPlanExpiry,
   formatIranDate,
   iranDaysUntil,
   iranYmd,
@@ -204,7 +205,7 @@ export class PluginsService implements OnModuleInit, OnModuleDestroy {
       if (!PLUGIN_PLAN_MONTHS.includes(planMonths as any)) {
         throw new BadRequestException('مدت اشتراک نامعتبر است');
       }
-      expiresAt = this.addMonths(chargedAt, planMonths);
+      expiresAt = addIranPlanExpiry(chargedAt, planMonths);
     }
 
     const plugin = await this.prisma.pluginSubscription.create({
@@ -277,7 +278,7 @@ export class PluginsService implements OnModuleInit, OnModuleDestroy {
       chargedAt &&
       planMonths
     ) {
-      expiresAt = this.addMonths(chargedAt, planMonths);
+      expiresAt = addIranPlanExpiry(chargedAt, planMonths);
     }
 
     const plugin = await this.prisma.pluginSubscription.update({
@@ -329,7 +330,7 @@ export class PluginsService implements OnModuleInit, OnModuleDestroy {
     if (Number.isNaN(chargedAt.getTime())) {
       throw new BadRequestException('تاریخ شارژ نامعتبر است');
     }
-    const expiresAt = this.addMonths(chargedAt, dto.planMonths);
+    const expiresAt = addIranPlanExpiry(chargedAt, dto.planMonths);
 
     await this.prisma.$transaction([
       this.prisma.pluginSubscription.update({
@@ -541,14 +542,6 @@ export class PluginsService implements OnModuleInit, OnModuleDestroy {
     }
   }
 
-  private addMonths(from: Date, months: number) {
-    const d = new Date(from.getTime());
-    const day = d.getDate();
-    d.setMonth(d.getMonth() + months);
-    if (d.getDate() < day) d.setDate(0);
-    return d;
-  }
-
   private async requireTenant(tenantId: string) {
     const tenant = await this.prisma.tenant.findUnique({ where: { id: tenantId } });
     if (!tenant) throw new NotFoundException('نسخه یافت نشد');

src/servers/servers.service.ts

@@ -17,6 +17,7 @@ import {
   UpdateServerAccountDto,
 } from './dto/server-account.dto';
 import {
+  addIranPlanExpiry,
   formatIranDate,
   iranDaysUntil,
   iranYmd,
@@ -210,7 +211,7 @@ export class ServersService implements OnModuleInit, OnModuleDestroy {
         chargedAt: dto.chargedAt ? new Date(dto.chargedAt) : null,
         expiresAt:
           dto.isDedicated !== true && dto.chargedAt && dto.planMonths
-            ? this.addMonths(new Date(dto.chargedAt), dto.planMonths)
+            ? addIranPlanExpiry(new Date(dto.chargedAt), dto.planMonths)
             : null,
       },
     });
@@ -256,7 +257,7 @@ export class ServersService implements OnModuleInit, OnModuleDestroy {
       chargedAt &&
       planMonths
     ) {
-      expiresAt = this.addMonths(chargedAt, planMonths);
+      expiresAt = addIranPlanExpiry(chargedAt, planMonths);
     }
 
     const updated = await this.prisma.serverAccount.update({
@@ -298,7 +299,7 @@ export class ServersService implements OnModuleInit, OnModuleDestroy {
       const fixed = await this.prisma.serverAccount.update({
         where: { id: updated.id },
         data: {
-          expiresAt: this.addMonths(updated.chargedAt, updated.planMonths),
+          expiresAt: addIranPlanExpiry(updated.chargedAt, updated.planMonths),
         },
       });
       Object.assign(updated, fixed);
@@ -384,7 +385,7 @@ export class ServersService implements OnModuleInit, OnModuleDestroy {
     if (Number.isNaN(chargedAt.getTime())) {
       throw new BadRequestException('تاریخ شارژ نامعتبر است');
     }
-    const expiresAt = this.addMonths(chargedAt, dto.planMonths);
+    const expiresAt = addIranPlanExpiry(chargedAt, dto.planMonths);
 
     await this.prisma.$transaction([
       this.prisma.serverAccount.update({
@@ -648,16 +649,6 @@ export class ServersService implements OnModuleInit, OnModuleDestroy {
     }
   }
 
-  private addMonths(from: Date, months: number) {
-    const d = new Date(from.getTime());
-    const day = d.getDate();
-    d.setMonth(d.getMonth() + months);
-    if (d.getDate() < day) {
-      d.setDate(0);
-    }
-    return d;
-  }
-
   private async requireAccount(accountId: string) {
     const account = await this.prisma.serverAccount.findUnique({
       where: { id: accountId },

src/support/support.service.ts

@@ -11,6 +11,7 @@ import { PrismaService } from '../prisma/prisma.service';
 import { AuditService } from '../audit/audit.service';
 import { AdminNotifyService } from '../notifications/admin-notify.service';
 import {
+  addIranPlanExpiry,
   formatIranDate,
   iranDaysUntil,
   iranYmd,
@@ -207,7 +208,7 @@ export class SupportService implements OnModuleInit, OnModuleDestroy {
       if (!SUPPORT_PLAN_MONTHS.includes(planMonths as any)) {
         throw new BadRequestException('مدت اشتراک نامعتبر است');
       }
-      expiresAt = this.addMonths(chargedAt, planMonths);
+      expiresAt = addIranPlanExpiry(chargedAt, planMonths);
     }
 
     const support = await this.prisma.supportSubscription.create({
@@ -282,7 +283,7 @@ export class SupportService implements OnModuleInit, OnModuleDestroy {
       chargedAt &&
       planMonths
     ) {
-      expiresAt = this.addMonths(chargedAt, planMonths);
+      expiresAt = addIranPlanExpiry(chargedAt, planMonths);
     }
 
     const support = await this.prisma.supportSubscription.update({
@@ -342,7 +343,7 @@ export class SupportService implements OnModuleInit, OnModuleDestroy {
     if (Number.isNaN(chargedAt.getTime())) {
       throw new BadRequestException('تاریخ شارژ نامعتبر است');
     }
-    const expiresAt = this.addMonths(chargedAt, dto.planMonths);
+    const expiresAt = addIranPlanExpiry(chargedAt, dto.planMonths);
 
     const noteBase = dto.note?.trim() || null;
     const note =
@@ -578,14 +579,6 @@ export class SupportService implements OnModuleInit, OnModuleDestroy {
     return isFree ? `${label} (رایگان)` : label;
   }
 
-  private addMonths(from: Date, months: number) {
-    const d = new Date(from.getTime());
-    const day = d.getDate();
-    d.setMonth(d.getMonth() + months);
-    if (d.getDate() < day) d.setDate(0);
-    return d;
-  }
-
   private async requireTenant(tenantId: string) {
     const tenant = await this.prisma.tenant.findUnique({ where: { id: tenantId } });
     if (!tenant) throw new NotFoundException('نسخه یافت نشد');