diff --git a/packages/utils/src/datetime-format.ts b/packages/utils/src/datetime-format.ts
index 8967dd6..bdce36e 100644
--- a/packages/utils/src/datetime-format.ts
+++ b/packages/utils/src/datetime-format.ts
@@ -1,9 +1,19 @@
 /* eslint-disable import/no-unassigned-import */
-import { isBrowser } from './environment';
-import 'dayjs/locale/ru';
 import dayjs from 'dayjs';
+import timezone from 'dayjs/plugin/timezone';
+import utc from 'dayjs/plugin/utc';
+import 'dayjs/locale/ru';
 import { noop } from 'radashi';
 
+// Подключаем плагины один раз
+if (!dayjs.prototype.tz) {
+  dayjs.extend(utc);
+  dayjs.extend(timezone);
+}
+
+// Europe/Moscow как дефолтный часовой пояс
+export const MOSCOW_TZ = 'Europe/Moscow';
+
 export function combineDateTime(date: Date, time: string) {
   const [hours = '00', minutes = '00'] = time.split(':');
 
@@ -20,23 +30,32 @@ export function formatDate(date: Date | string) {
   if (!date) return { db: noop, user: noop };
 
   return {
-    db: () => dayjs(date).format('YYYY-MM-DD'),
-    user: (template?: string, fallbackLang: string = 'ru') => {
-      const lang = isBrowser() ? document.documentElement.lang || fallbackLang : fallbackLang;
-
-      dayjs.locale(lang);
-
-      return dayjs(date).format(template || 'D MMMM YYYY');
+    db: (tz: string = MOSCOW_TZ) => {
+      // date — локальная дата в tz
+      const local = dayjs.tz(date, tz);
+      return local.utc().format('YYYY-MM-DD');
+    },
+    user: (template?: string, tz: string = MOSCOW_TZ) => {
+      return dayjs
+        .utc(date)
+        .tz(tz)
+        .format(template || 'D MMMM YYYY');
     },
   };
 }
 
 export function formatTime(time: string) {
   const [hours = '00', minutes = '00'] = time.split(':');
-
   return {
-    db: () => `${hours}:${minutes}:00`,
-    user: () => `${hours}:${minutes}`,
+    // time — локальное время в tz (по умолчанию Europe/Moscow)
+    db: (tz: string = MOSCOW_TZ) => {
+      const local = dayjs.tz(`1970-01-01T${hours}:${minutes}:00`, tz);
+      return local.utc().format('HH:mm:00');
+    },
+    user: (tz: string = MOSCOW_TZ) => {
+      const utcTime = dayjs.utc(`1970-01-01T${hours}:${minutes}:00Z`);
+      return utcTime.tz(tz).format('HH:mm');
+    },
   };
 }