diff --git a/src/Lib/Assert/Text.php b/src/Lib/Assert/Text.php
index b402e45..4b134c6 100644
--- a/src/Lib/Assert/Text.php
+++ b/src/Lib/Assert/Text.php
@@ -11,9 +11,9 @@ class Text
      *
      * @return bool
      */
-    public static function isEmail(string $email): bool
+    public static function isEmail(string $str): bool
     {
-        return filter_var($email, FILTER_VALIDATE_EMAIL) === false ? false : true;
+        return filter_var($str, FILTER_VALIDATE_EMAIL) === false ? false : true;
     }
 
     
@@ -37,4 +37,23 @@ public static function hasMin(int $lim, string $str): bool
     {
         return strlen($str) >= $lim;
     }
+
+
+    /**
+     * Test if string is date
+     *
+     * @return bool
+     */
+    public static function isTimestamp(string $str): bool
+    {
+        $ts = \App\Lib\Util\Timestamp::timestampToArray($str);
+        if (checkdate($ts['m'], $ts['d'], $ts['y']) &&
+            $ts['h'] >= 0 && $ts['h'] <= 23 &&
+            $ts['i'] >= 0 && $ts['i'] <= 59 &&
+            $ts['s'] >= 0 && $ts['s'] <= 59) {
+            return true;
+        } else {
+            return false;
+        }
+    }
 }
diff --git a/src/Lib/Util/Timestamp.php b/src/Lib/Util/Timestamp.php
new file mode 100644
index 0000000..b1589f9
--- /dev/null
+++ b/src/Lib/Util/Timestamp.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Lib\Util;
+
+use Exception;
+
+class Timestamp
+{
+    /**
+     * Retruns array from date string
+     *
+     * @param  string $str
+     * @return array<int>
+     */
+    public static function timestampToArray(string $str): array
+    {
+        if (strpos($str, ' ')) {
+            $ts = explode(' ', $str);
+        } else if (strpos($str, 'T')) {
+            $ts = explode('T', $str);
+            $ts[1] .= ':00';
+        } else {
+            throw new Exception('Timestamp is Not in right format YYYY-MM-DD HH:II:SS', 400);
+        }
+
+        $date = explode('-', $ts[0]);
+        $time = explode(':', $ts[1]);
+
+        if (sizeof($date) == 3 && sizeof($time) == 3 &&
+            is_numeric($date[0]) && is_numeric($date[1]) && is_numeric($date[2]) &&
+            is_numeric($time[0]) && is_numeric($time[1]) && is_numeric($time[2])) {
+            return (array('y' => intval($date[0]), 'm' => intval($date[1]), 'd' => intval($date[2]), 'h' => intval($time[0]), 'i' => intval($time[1]), 's' => intval($time[2])));
+        } else {
+            throw new Exception('Timestamp is Not in right format YYYY-MM-DD HH:II:SS', 400);
+        }
+    }
+}