diff --git a/application/Espo/Core/Formula/Exceptions/BadArgumentValue.php b/application/Espo/Core/Formula/Exceptions/BadArgumentValue.php
new file mode 100644
index 0000000000..10f4e167bc
--- /dev/null
+++ b/application/Espo/Core/Formula/Exceptions/BadArgumentValue.php
@@ -0,0 +1,34 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Formula\Exceptions;
+
+class BadArgumentValue extends Error
+{
+}
diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/AtType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/AtType.php
index f136eae70f..3ab3646fe5 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/AtType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/AtType.php
@@ -29,23 +29,33 @@
 
 namespace Espo\Core\Formula\Functions\ArrayGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-class AtType extends \Espo\Core\Formula\Functions\Base
+class AtType extends BaseFunction
 {
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        $args = $this->fetchArguments($item);
-        if (count($args) < 2) throw new Error("Formula: array\\at: Not enough arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
+        }
 
         $array = $args[0];
         $index = $args[1];
 
-        if (!is_array($array)) throw new Error("Formula: array\\at: First argument must be array.");
-        if (!is_int($index)) throw new Error("Formula: array\\at: Second argument must be integer.");
+        if (!is_array($array)) {
+            $this->throwBadArgumentType(1, 'array');
+        }
+        if (!is_int($index)) {
+            $this->throwBadArgumentType(2, 'int');
+        }
 
         if (!array_key_exists($index, $array)) {
-            $GLOBALS['log']->notice("Formula: array\\at: Index doesn't exist.");
+            $this->log("index doesn't exist");
             return null;
         }
 
diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/IncludesType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/IncludesType.php
index 2ef78a6afb..98601f492c 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/IncludesType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/IncludesType.php
@@ -29,17 +29,23 @@
 
 namespace Espo\Core\Formula\Functions\ArrayGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-class IncludesType extends \Espo\Core\Formula\Functions\Base
+class IncludesType extends BaseFunction
 {
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 2) {
-            throw new Error('Too few arguments passed to \'array\\includes\'.');
+        $args = $this->evaluate($args);
+
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
         }
-        $list = $this->evaluate($item->value[0]);
-        $needle = $this->evaluate($item->value[1]);
+
+        $list = $args[0];
+        $needle = $args[1];
 
         if (!is_array($list)) {
             return false;
diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/LengthType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/LengthType.php
index 2a39de862a..2592dda590 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/LengthType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/LengthType.php
@@ -29,17 +29,22 @@
 
 namespace Espo\Core\Formula\Functions\ArrayGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-class LengthType extends \Espo\Core\Formula\Functions\Base
+class LengthType extends BaseFunction
 {
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-            throw new Error('No argument passed to \'array\\length\'.');
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $list = $this->evaluate($item->value[0]);
+        $list = $args[0];
 
         if (!is_array($list)) {
             return 0;
diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/PushType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/PushType.php
index 02e5f8f941..1ec2cb018a 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/PushType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/PushType.php
@@ -29,23 +29,28 @@
 
 namespace Espo\Core\Formula\Functions\ArrayGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-class PushType extends \Espo\Core\Formula\Functions\Base
+class PushType extends BaseFunction
 {
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 2) {
-            throw new Error('Too few arguments passed to \'Array\\push\'.');
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
         }
-        $list = $this->evaluate($item->value[0]);
+
+        $list = $this->evaluate($args[0]);
+
         if (!is_array($list)) {
             return false;
         }
 
-        foreach ($item->value as $i => $v) {
+        foreach ($args as $i => $v) {
             if ($i === 0) continue;
-            $element = $this->evaluate($item->value[$i]);
+            $element = $this->evaluate($args[$i]);
             $list[] = $element;
         }
 
diff --git a/application/Espo/Core/Formula/Functions/BaseFunction.php b/application/Espo/Core/Formula/Functions/BaseFunction.php
index 2ab9b7d554..434e380b85 100644
--- a/application/Espo/Core/Formula/Functions/BaseFunction.php
+++ b/application/Espo/Core/Formula/Functions/BaseFunction.php
@@ -38,6 +38,7 @@ use Espo\Core\Formula\{
     Evaluatable,
     Exceptions\TooFewArguments,
     Exceptions\BadArgumentType,
+    Exceptions\BadArgumentValue,
     Exceptions\NotPassedEntity,
 };
 
@@ -98,11 +99,17 @@ abstract class BaseFunction
         return $this->processor->process($item);
     }
 
+    /**
+     * Throw TooFewArguments exception.
+     */
     protected function throwTooFewArguments()
     {
         throw new TooFewArguments('function: ' . $this->name);
     }
 
+    /**
+     * Throw BadArgumentType exception.
+     */
     protected function throwBadArgumentType(?int $index = null, ?string $type = null)
     {
         $msg = 'function: ' . $this->name;
@@ -115,10 +122,38 @@ abstract class BaseFunction
         throw new BadArgumentType($msg);
     }
 
+    /**
+     * Throw BadArgumentValue exception.
+     */
+    protected function throwBadArgumentValue(?int $index = null, ?string $msg = null)
+    {
+        $string = $msg;
+
+        $msg = 'function: ' . $this->name;
+        if ($index !== null) {
+            $msg .= ', index: ' . $index;
+            if ($msg) {
+                $msg .= ', ' . $string;
+            }
+        }
+        throw new BadArgumentValue($msg);
+    }
+
+    /**
+     * Log a bad argument type.
+     */
     protected function logBadArgumentType(int $index, string $type)
     {
         if (!$this->log) return;
-
         $this->log->warning("Formula function: {$this->name}, argument {$index} should be '{$type}'.");
     }
+
+    /**
+     * Log a message.
+     */
+    protected function log(string $msg, string $level = 'notice')
+    {
+        if (!$this->log) return;
+        $this->log->log($level, 'function: ' . $this->name . ', ' . $msg);
+    }
 }
diff --git a/application/Espo/Core/Formula/Functions/ComparisonGroup/Base.php b/application/Espo/Core/Formula/Functions/ComparisonGroup/Base.php
index e4116488a1..7e1a81bb62 100644
--- a/application/Espo/Core/Formula/Functions/ComparisonGroup/Base.php
+++ b/application/Espo/Core/Formula/Functions/ComparisonGroup/Base.php
@@ -29,26 +29,21 @@
 
 namespace Espo\Core\Formula\Functions\ComparisonGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-abstract class Base extends \Espo\Core\Formula\Functions\Base
+abstract class Base extends BaseFunction
 {
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 2) {
-            throw new Error('Formula comparison function: Too few arguments passed.');
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
         }
 
-        if (is_object($item->value[0])) {
-            $left = $this->evaluate($item->value[0]);
-        } else {
-            $left = $item->value[0];
-        }
-        if (is_object($item->value[1])) {
-            $right = $this->evaluate($item->value[1]);
-        } else {
-            $right = $item->value[1];
-        }
+        $left = $this->evaluate($args[0]);
+        $right = $this->evaluate($args[1]);
 
         return $this->compare($left, $right);
     }
diff --git a/application/Espo/Core/Formula/Functions/ComparisonGroup/EqualsType.php b/application/Espo/Core/Formula/Functions/ComparisonGroup/EqualsType.php
index e87794c97f..ab5aa6e64d 100644
--- a/application/Espo/Core/Formula/Functions/ComparisonGroup/EqualsType.php
+++ b/application/Espo/Core/Formula/Functions/ComparisonGroup/EqualsType.php
@@ -29,8 +29,6 @@
 
 namespace Espo\Core\Formula\Functions\ComparisonGroup;
 
-use Espo\Core\Exceptions\Error;
-
 class EqualsType extends Base
 {
     protected function compare($left, $right)
diff --git a/application/Espo/Core/Formula/Functions/ComparisonGroup/GreaterThanOrEqualsType.php b/application/Espo/Core/Formula/Functions/ComparisonGroup/GreaterThanOrEqualsType.php
index 6dd85b9bb8..f2b9ce803b 100644
--- a/application/Espo/Core/Formula/Functions/ComparisonGroup/GreaterThanOrEqualsType.php
+++ b/application/Espo/Core/Formula/Functions/ComparisonGroup/GreaterThanOrEqualsType.php
@@ -36,4 +36,3 @@ class GreaterThanOrEqualsType extends Base
         return $left >= $right;
     }
 }
-
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/AddIntervalType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/AddIntervalType.php
index 09ee7bddfa..450a851483 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/AddIntervalType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/AddIntervalType.php
@@ -29,36 +29,43 @@
 
 namespace Espo\Core\Formula\Functions\DatetimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-abstract class AddIntervalType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+use DateTime;
+
+abstract class AddIntervalType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
     protected $timeOnly = false;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 2) {
-            throw new Error("Add Interval function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
         }
 
-        $dateTimeString = $this->evaluate($item->value[0]);
+        $dateTimeString = $args[0];
 
         if (!$dateTimeString) {
             return null;
         }
 
         if (!is_string($dateTimeString)) {
-            throw new Error();
+            $this->throwBadArgumentType(1, 'string');
         }
 
-        $interval = $this->evaluate($item->value[1]);
+        $interval = $args[1];
 
         if (!is_numeric($interval)) {
-            throw new Error();
+            $this->throwBadArgumentType(2, 'numeric');
         }
 
         $isTime = false;
@@ -72,8 +79,9 @@ abstract class AddIntervalType extends \Espo\Core\Formula\Functions\Base impleme
         }
 
         try {
-            $dateTime = new \DateTime($dateTimeString);
+            $dateTime = new DateTime($dateTimeString);
         } catch (\Exception $e) {
+            $this->log('bad date-time value passed', 'warning');
             return null;
         }
 
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/ClosestType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/ClosestType.php
index 7a78cc175b..f220507613 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/ClosestType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/ClosestType.php
@@ -29,36 +29,44 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class ClosestType extends \Espo\Core\Formula\Functions\Base implements Di\ConfigAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+use DateTime;
+use DateTimeZone;
+
+class ClosestType extends BaseFunction implements Di\ConfigAware
 {
     use Di\ConfigSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 3) {
-            throw new Error("Closest function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 3) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
-        $type = $this->evaluate($item->value[1]);
-        $target = $this->evaluate($item->value[2]);
+        $value = $args[0];
+        $type = $args[1];
+        $target = $args[2];
 
         if (!in_array($type, ['time', 'minute', 'hour', 'date', 'dayOfWeek', 'month'])) {
-            throw new Error('Bad TYPE passed to datetime\\closest function.');
+            $this->throwBadArgumentType(1);
         }
 
         $inPast = false;
-        if (count($item->value) > 3) {
-            $inPast = $this->evaluate($item->value[3]);
+        if (count($args) > 3) {
+            $inPast = $args[3];
         }
 
         $timezone = null;
-        if (count($item->value) > 4) {
-            $timezone = $this->evaluate($item->value[4]);
+        if (count($args) > 4) {
+            $timezone = $args[4];
         }
 
         if (!$value) {
@@ -66,7 +74,7 @@ class ClosestType extends \Espo\Core\Formula\Functions\Base implements Di\Config
         }
 
         if (!is_string($value)) {
-            throw new Error('Bad VALUE passed to datetime\\closest function.');
+            $this->throwBadArgumentType(1, 'string');
         }
 
         if (!$timezone) {
@@ -85,12 +93,12 @@ class ClosestType extends \Espo\Core\Formula\Functions\Base implements Di\Config
 
         $format = 'Y-m-d H:i:s';
 
-        $dt = \DateTime::createFromFormat($format, $value, new \DateTimeZone($timezone));
+        $dt = DateTime::createFromFormat($format, $value, new DateTimeZone($timezone));
         $valueTimestamp = $dt->getTimestamp();
 
         if ($type === 'time') {
             if (!is_string($target)) {
-                throw new Error('Bad TARGET passed to datetime\\closest function.');
+                $this->throwBadArgumentType(3, 'string');
             }
             list($hour, $minute) = explode(':', $target);
             if (!$hour) {
@@ -209,7 +217,7 @@ class ClosestType extends \Espo\Core\Formula\Functions\Base implements Di\Config
         }
 
         if (!$isDate) {
-            $dt->setTimezone(new \DateTimeZone('UTC'));
+            $dt->setTimezone(new DateTimeZone('UTC'));
             return $dt->format('Y-m-d H:i');
         } else {
             return $dt->format('Y-m-d');
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/DateType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/DateType.php
index a72d375548..8865b446a0 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/DateType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/DateType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class DateType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class DateType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-             throw new Error("Date function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+             $timezone = $args[1];
         }
 
         if (empty($value)) return 0;
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/DayOfWeekType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/DayOfWeekType.php
index d5fb383664..9294ed53fe 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/DayOfWeekType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/DayOfWeekType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class DayOfWeekType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class DayOfWeekType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-             throw new Error("DayOfWeek function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+             $timezone = $args[1];
         }
 
         if (empty($value)) return -1;
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/DiffType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/DiffType.php
index bd3d702165..a07a6aeb97 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/DiffType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/DiffType.php
@@ -29,22 +29,34 @@
 
 namespace Espo\Core\Formula\Functions\DatetimeGroup;
 
-use Espo\Core\Exceptions\Error;
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
 
-class DiffType extends \Espo\Core\Formula\Functions\Base
+use DateTime;
+
+class DiffType extends BaseFunction
 {
     protected $intevalTypePropertyMap = [
-        'years' => 'y', 'months' => 'm', 'days' => 'd', 'hours' => 'h', 'minutes' => 'i', 'seconds' => 's'
+        'years' => 'y',
+        'months' => 'm',
+        'days' => 'd',
+        'hours' => 'h',
+        'minutes' => 'i',
+        'seconds' => 's',
     ];
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 2) {
-            throw new Error("Diff function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 2) {
+            $this->throwTooFewArguments();
         }
 
-        $dateTime1String = $this->evaluate($item->value[0]);
-        $dateTime2String = $this->evaluate($item->value[1]);
+        $dateTime1String = $args[0];
+        $dateTime2String = $args[1];
 
         if (!$dateTime1String) {
             return null;
@@ -55,35 +67,34 @@ class DiffType extends \Espo\Core\Formula\Functions\Base
         }
 
         if (!is_string($dateTime1String)) {
-            throw new Error();
+            $this->throwBadArgumentType(1, 'string');
         }
 
         if (!is_string($dateTime2String)) {
-            throw new Error();
+            $this->throwBadArgumentType(2, 'string');
         }
 
         $intervalType = 'days';
-        if (count($item->value) > 2) {
-            $intervalType = $this->evaluate($item->value[2]);
+        if (count($args) > 2) {
+            $intervalType = $args[2];
         }
 
         if (!is_string($intervalType)) {
-            throw new Error();
+            $this->throwBadArgumentType(3, 'string');
         }
 
         if (!array_key_exists($intervalType, $this->intevalTypePropertyMap)) {
-            throw new Error('Not supported interval type' . $intervalType);
+            $this->throwBadArgumentValue(3, "not supported interval type '{$intervalType}'");
         }
 
-
         $isTime = false;
         if (strlen($dateTime1String) > 10) {
             $isTime = true;
         }
 
         try {
-            $dateTime1 = new \DateTime($dateTime1String);
-            $dateTime2 = new \DateTime($dateTime2String);
+            $dateTime1 = new DateTime($dateTime1String);
+            $dateTime2 = new DateTime($dateTime2String);
         } catch (\Exception $e) {
             return null;
         }
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/FormatType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/FormatType.php
index 5e30ac01f8..4f91fd676a 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/FormatType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/FormatType.php
@@ -29,29 +29,34 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class FormatType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class FormatType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-             throw new Error("Format function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
         $timezone = null;
-        if (count($item->value) > 1) {
-            $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+            $timezone = $args[1];
         }
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $format = null;
-        if (count($item->value) > 2) {
-            $format = $this->evaluate($item->value[2]);
+        if (count($args) > 2) {
+            $format = $args[2];
         }
 
         if (strlen($value) > 11) {
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/HourType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/HourType.php
index 8e110aa4a4..bc9d8ef2c5 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/HourType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/HourType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class HourType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class HourType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-             throw new Error("Hour function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+            $timezone = $args[1];
         }
 
         if (empty($value)) return -1;
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/MinuteType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/MinuteType.php
index 04c845d1b7..1255d840db 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/MinuteType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/MinuteType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class MinuteType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class MinuteType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-            throw new Error("Minute function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+             $timezone = $args[1];
         }
 
         if (empty($value)) return -1;
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/MonthType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/MonthType.php
index ea77ade6f9..968ec85b2c 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/MonthType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/MonthType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class MonthType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class MonthType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-            throw new Error("Month function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+             $timezone = $args[1];
         }
 
         if (empty($value)) return 0;
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/NowType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/NowType.php
index fc9a8f08ed..681e4a22a6 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/NowType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/NowType.php
@@ -31,11 +31,16 @@ namespace Espo\Core\Formula\Functions\DatetimeGroup;
 
 use Espo\Core\Di;
 
-class NowType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class NowType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
         return $this->dateTime->getInternalNowString();
     }
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/TodayType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/TodayType.php
index b407ca351b..d4440108a4 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/TodayType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/TodayType.php
@@ -31,11 +31,16 @@ namespace Espo\Core\Formula\Functions\DatetimeGroup;
 
 use Espo\Core\Di;
 
-class TodayType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class TodayType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
         return $this->dateTime->getInternalTodayString();
     }
diff --git a/application/Espo/Core/Formula/Functions/DatetimeGroup/YearType.php b/application/Espo/Core/Formula/Functions/DatetimeGroup/YearType.php
index a2655e3aac..b858bfa969 100644
--- a/application/Espo/Core/Formula/Functions/DatetimeGroup/YearType.php
+++ b/application/Espo/Core/Formula/Functions/DatetimeGroup/YearType.php
@@ -29,25 +29,30 @@
 
 namespace Espo\Core\Formula\Functions\DateTimeGroup;
 
-use Espo\Core\Exceptions\Error;
-
 use Espo\Core\Di;
 
-class YearType extends \Espo\Core\Formula\Functions\Base implements Di\DateTimeAware
+use Espo\Core\Formula\{
+    Functions\BaseFunction,
+    ArgumentList,
+};
+
+class YearType extends BaseFunction implements Di\DateTimeAware
 {
     use Di\DateTimeSetter;
 
-    public function process(\StdClass $item)
+    public function process(ArgumentList $args)
     {
-        if (count($item->value) < 1) {
-             throw new Error("Year function: Too few arguments.");
+        $args = $this->evaluate($args);
+
+        if (count($args) < 1) {
+            $this->throwTooFewArguments();
         }
 
-        $value = $this->evaluate($item->value[0]);
+        $value = $args[0];
 
         $timezone = null;
-        if (count($item->value) > 1) {
-             $timezone = $this->evaluate($item->value[1]);
+        if (count($args) > 1) {
+             $timezone = $args[1];
         }
 
         if (empty($value)) return 0;