diff --git a/Web/Presenters/InternalAPIPresenter.php b/Web/Presenters/InternalAPIPresenter.php
index a8933639..51f03cd3 100644
--- a/Web/Presenters/InternalAPIPresenter.php
+++ b/Web/Presenters/InternalAPIPresenter.php
@@ -1,6 +1,7 @@
 <?php declare(strict_types=1);
 namespace openvk\Web\Presenters;
 use MessagePack\MessagePack;
+use Chandler\Session\Session;
 
 final class InternalAPIPresenter extends OpenVKPresenter
 {
@@ -68,4 +69,28 @@ final class InternalAPIPresenter extends OpenVKPresenter
             $this->fail(-32603, "Uncaught " . get_class($ex));
         }
     }
+
+    function renderTimezone() {
+        if($_SERVER["REQUEST_METHOD"] !== "POST")
+            exit("ты дебил это метод апи");
+
+        $sessionOffset = Session::i()->get("_timezoneOffset");
+        if(is_numeric($this->postParam("timezone"))) {
+            $postTZ = intval($this->postParam("timezone"));
+            if ($postTZ != $sessionOffset || $sessionOffset == null) {
+                Session::i()->set("_timezoneOffset", $postTZ ? $postTZ : 3 * MINUTE );
+                $this->returnJson([
+                    "success" => 1 // If it's new value
+                ]);
+            } else {
+                $this->returnJson([
+                    "success" => 2 // If it's the same value (if for some reason server will call this func)
+                ]);
+            }
+        } else {
+            $this->returnJson([
+                "success" => 0
+            ]);
+        }
+    }
 }
diff --git a/Web/Presenters/OpenVKPresenter.php b/Web/Presenters/OpenVKPresenter.php
index 1f2ad294..c232cd91 100755
--- a/Web/Presenters/OpenVKPresenter.php
+++ b/Web/Presenters/OpenVKPresenter.php
@@ -201,6 +201,7 @@ abstract class OpenVKPresenter extends SimplePresenter
         $user = Authenticator::i()->getUser();
         
         $this->template->isXmas = intval(date('d')) >= 1 && date('m') == 12 || intval(date('d')) <= 15 && date('m') == 1 ? true : false;
+        $this->template->isTimezoned = Session::i()->get("_timezoneOffset");
         
         if(!is_null($user)) {
             $this->user = (object) [];
diff --git a/Web/Presenters/templates/@layout.xml b/Web/Presenters/templates/@layout.xml
index 10ebec28..d410bc84 100644
--- a/Web/Presenters/templates/@layout.xml
+++ b/Web/Presenters/templates/@layout.xml
@@ -17,6 +17,10 @@
         {script "js/l10n.js"}
         {script "js/openvk.cls.js"}
 
+        {if $isTimezoned == null}
+            {script "js/timezone.js"}
+        {/if}
+
         {ifset $thisUser}
             {if $thisUser->getNsfwTolerance() < 2}
                 {css "css/nsfw-posts.css"}
diff --git a/Web/routes.yml b/Web/routes.yml
index ec53b002..e22f938e 100644
--- a/Web/routes.yml
+++ b/Web/routes.yml
@@ -9,6 +9,8 @@ routes:
       handler: "About->rules"
     - url: "/rpc"
       handler: "InternalAPI->route"
+    - url: "/iapi/timezone"
+      handler: "InternalAPI->timezone"
     - url: "/support"
       handler: "Support->index"
     - url: "/support/tickets"
diff --git a/Web/static/js/timezone.js b/Web/static/js/timezone.js
new file mode 100755
index 00000000..a85472fd
--- /dev/null
+++ b/Web/static/js/timezone.js
@@ -0,0 +1,7 @@
+// This file is included only when there is no info about timezone in users's chandler session
+
+xhr = new XMLHttpRequest();
+xhr.open("POST", "/iapi/timezone", true);
+xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
+xhr.onload = () => {window.location.reload()};
+xhr.send('timezone=' + new Date().getTimezoneOffset());
diff --git a/bootstrap.php b/bootstrap.php
index c4ac5395..5c1fb0d7 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -167,7 +167,8 @@ function ovk_proc_strtrim(string $string, int $length = 0): string
 
 function ovk_strftime_safe(string $format, ?int $timestamp = NULL): string
 {
-    $str = strftime($format, $timestamp ?? time());
+    $sessionOffset = intval(Session::i()->get("_timezoneOffset"));
+    $str = strftime($format, $timestamp + ($sessionOffset * MINUTE) * -1 ?? time() + ($sessionOffset * MINUTE) * -1);
     if(PHP_SHLIB_SUFFIX === "dll") {
         $enc = tr("__WinEncoding");
         if($enc === "@__WinEncoding")