chore: use Intl for date formatting (#3588)

* chore: use `Intl` for date formatting

* fix: show last traffic reset

* chore: use raw timestamps

* fix: remove unnecessary import

web/assets/js/util/index.js

@@ -882,4 +882,35 @@ class FileManager {
 
         link.remove();
     }
+}
+
+class IntlUtil {
+    static formatDate(date) {
+        const language = LanguageManager.getLanguage()
+
+        let intlOptions = {
+            year: "numeric",
+            month: "numeric",
+            day: "numeric",
+            hour: "numeric",
+            minute: "numeric",
+            second: "numeric"
+        }
+
+        const intl = new Intl.DateTimeFormat(
+            language,
+            intlOptions
+        )
+
+        return intl.format(new Date(date))
+    }
+    static formatRelativeTime(date) {
+        const language = LanguageManager.getLanguage()
+        const now = new Date()
+
+        const diff = Math.round((date - now) / (1000 * 60 * 60 * 24))
+        const formatter = new Intl.RelativeTimeFormat(language, { numeric: 'auto' })
+
+        return formatter.format(diff, 'day');
+    }
 }