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system/Helpers/date_helper.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+// CodeIgniter Date Helpers
+
+if (! function_exists('now')) {
+    /**
+     * Get "now" time
+     *
+     * Returns time() based on the timezone parameter or on the
+     * app_timezone() setting
+     *
+     * @param string $timezone
+     *
+     * @throws Exception
+     */
+    function now(?string $timezone = null): int
+    {
+        $timezone = empty($timezone) ? app_timezone() : $timezone;
+
+        if ($timezone === 'local' || $timezone === date_default_timezone_get()) {
+            return time();
+        }
+
+        $datetime = new DateTime('now', new DateTimeZone($timezone));
+        sscanf($datetime->format('j-n-Y G:i:s'), '%d-%d-%d %d:%d:%d', $day, $month, $year, $hour, $minute, $second);
+
+        return mktime($hour, $minute, $second, $month, $day, $year);
+    }
+}
+
+if (! function_exists('timezone_select')) {
+    /**
+     * Generates a select field of all available timezones
+     *
+     * Returns a string with the formatted HTML
+     *
+     * @param string $class   Optional class to apply to the select field
+     * @param string $default Default value for initial selection
+     * @param int    $what    One of the DateTimeZone class constants (for listIdentifiers)
+     * @param string $country A two-letter ISO 3166-1 compatible country code (for listIdentifiers)
+     *
+     * @throws Exception
+     */
+    function timezone_select(string $class = '', string $default = '', int $what = DateTimeZone::ALL, ?string $country = null): string
+    {
+        $timezones = DateTimeZone::listIdentifiers($what, $country);
+
+        $buffer = "<select name='timezone' class='{$class}'>" . PHP_EOL;
+
+        foreach ($timezones as $timezone) {
+            $selected = ($timezone === $default) ? 'selected' : '';
+            $buffer .= "<option value='{$timezone}' {$selected}>{$timezone}</option>" . PHP_EOL;
+        }
+
+        return $buffer . ('</select>' . PHP_EOL);
+    }
+}