diff --git a/schedule/parse.php b/schedule/parse.php
index ba1bb82..fa7956f 100644
--- a/schedule/parse.php
+++ b/schedule/parse.php
@@ -1,4 +1,7 @@
 <?php
+require 'php-8.1-strftime.php';
+use function PHP81_BC\strftime;
+
 function parseData($config, $data) {
 	$languages = array(
 		'en' => array(
diff --git a/schedule/php-8.1-strftime.php b/schedule/php-8.1-strftime.php
new file mode 100644
index 0000000..d092030
--- /dev/null
+++ b/schedule/php-8.1-strftime.php
@@ -0,0 +1,217 @@
+<?php
+namespace PHP81_BC;
+
+use DateTime;
+use DateTimeZone;
+use DateTimeInterface;
+use Exception;
+use IntlDateFormatter;
+use IntlGregorianCalendar;
+use InvalidArgumentException;
+
+/**
+ * Locale-formatted strftime using IntlDateFormatter (PHP 8.1 compatible)
+ * This provides a cross-platform alternative to strftime() for when it will be removed from PHP.
+ * Note that output can be slightly different between libc sprintf and this function as it is using ICU.
+ *
+ * Usage:
+ * use function \PHP81_BC\strftime;
+ * echo strftime('%A %e %B %Y %X', new \DateTime('2021-09-28 00:00:00'), 'fr_FR');
+ *
+ * Original use:
+ * \setlocale(LC_TIME, 'fr_FR.UTF-8');
+ * echo \strftime('%A %e %B %Y %X', strtotime('2021-09-28 00:00:00'));
+ *
+ * @param  string $format Date format
+ * @param  integer|string|DateTime $timestamp Timestamp
+ * @return string
+ * @author BohwaZ <https://bohwaz.net/>
+ */
+function strftime (string $format, $timestamp = null, ?string $locale = null) : string {
+    if (!($timestamp instanceof DateTimeInterface)) {
+        $timestamp = is_int($timestamp) ? '@' . $timestamp : (string) $timestamp;
+
+        try {
+            $timestamp = new DateTime($timestamp);
+        } catch (Exception $e) {
+            throw new InvalidArgumentException('$timestamp argument is neither a valid UNIX timestamp, a valid date-time string or a DateTime object.', 0, $e);
+        }
+    }
+
+    $timestamp->setTimezone(new DateTimeZone(date_default_timezone_get()));
+
+    if (empty($locale)) {
+        // get current locale
+        $locale = setlocale(LC_TIME, '0');
+    }
+    // remove trailing part not supported by ext-intl locale
+    $locale = preg_replace('/[^\w-].*$/', '', $locale);
+
+    $intl_formats = [
+        '%a' => 'EEE',	// An abbreviated textual representation of the day	Sun through Sat
+        '%A' => 'EEEE',	// A full textual representation of the day	Sunday through Saturday
+        '%b' => 'MMM',	// Abbreviated month name, based on the locale	Jan through Dec
+        '%B' => 'MMMM',	// Full month name, based on the locale	January through December
+        '%h' => 'MMM',	// Abbreviated month name, based on the locale (an alias of %b)	Jan through Dec
+    ];
+
+    $intl_formatter = function (DateTimeInterface $timestamp, string $format) use ($intl_formats, $locale) {
+        $tz = $timestamp->getTimezone();
+        $date_type = IntlDateFormatter::FULL;
+        $time_type = IntlDateFormatter::FULL;
+        $pattern = '';
+
+        switch ($format) {
+            // %c = Preferred date and time stamp based on locale
+            // Example: Tue Feb 5 00:45:10 2009 for February 5, 2009 at 12:45:10 AM
+            case '%c':
+                $date_type = IntlDateFormatter::LONG;
+                $time_type = IntlDateFormatter::SHORT;
+                break;
+
+            // %x = Preferred date representation based on locale, without the time
+            // Example: 02/05/09 for February 5, 2009
+            case '%x':
+                $date_type = IntlDateFormatter::SHORT;
+                $time_type = IntlDateFormatter::NONE;
+                break;
+
+            // Localized time format
+            case '%X':
+                $date_type = IntlDateFormatter::NONE;
+                $time_type = IntlDateFormatter::MEDIUM;
+                break;
+
+            default:
+                $pattern = $intl_formats[$format];
+        }
+
+        // In October 1582, the Gregorian calendar replaced the Julian in much of Europe, and
+        //  the 4th October was followed by the 15th October.
+        // ICU (including IntlDateFormattter) interprets and formats dates based on this cutover.
+        // Posix (including strftime) and timelib (including DateTimeImmutable) instead use
+        //  a "proleptic Gregorian calendar" - they pretend the Gregorian calendar has existed forever.
+        // This leads to the same instants in time, as expressed in Unix time, having different representations
+        //  in formatted strings.
+        // To adjust for this, a custom calendar can be supplied with a cutover date arbitrarily far in the past.
+        $calendar = IntlGregorianCalendar::createInstance();
+        $calendar->setGregorianChange(PHP_INT_MIN);
+
+        return (new IntlDateFormatter($locale, $date_type, $time_type, $tz, $calendar, $pattern))->format($timestamp);
+    };
+
+    // Same order as https://www.php.net/manual/en/function.strftime.php
+    $translation_table = [
+        // Day
+        '%a' => $intl_formatter,
+        '%A' => $intl_formatter,
+        '%d' => 'd',
+        '%e' => function ($timestamp) {
+            return sprintf('% 2u', $timestamp->format('j'));
+        },
+        '%j' => function ($timestamp) {
+            // Day number in year, 001 to 366
+            return sprintf('%03d', $timestamp->format('z')+1);
+        },
+        '%u' => 'N',
+        '%w' => 'w',
+
+        // Week
+        '%U' => function ($timestamp) {
+            // Number of weeks between date and first Sunday of year
+            $day = new DateTime(sprintf('%d-01 Sunday', $timestamp->format('Y')));
+            return sprintf('%02u', 1 + ($timestamp->format('z') - $day->format('z')) / 7);
+        },
+        '%V' => 'W',
+        '%W' => function ($timestamp) {
+            // Number of weeks between date and first Monday of year
+            $day = new DateTime(sprintf('%d-01 Monday', $timestamp->format('Y')));
+            return sprintf('%02u', 1 + ($timestamp->format('z') - $day->format('z')) / 7);
+        },
+
+        // Month
+        '%b' => $intl_formatter,
+        '%B' => $intl_formatter,
+        '%h' => $intl_formatter,
+        '%m' => 'm',
+
+        // Year
+        '%C' => function ($timestamp) {
+            // Century (-1): 19 for 20th century
+            return floor($timestamp->format('Y') / 100);
+        },
+        '%g' => function ($timestamp) {
+            return substr($timestamp->format('o'), -2);
+        },
+        '%G' => 'o',
+        '%y' => 'y',
+        '%Y' => 'Y',
+
+        // Time
+        '%H' => 'H',
+        '%k' => function ($timestamp) {
+            return sprintf('% 2u', $timestamp->format('G'));
+        },
+        '%I' => 'h',
+        '%l' => function ($timestamp) {
+            return sprintf('% 2u', $timestamp->format('g'));
+        },
+        '%M' => 'i',
+        '%p' => 'A', // AM PM (this is reversed on purpose!)
+        '%P' => 'a', // am pm
+        '%r' => 'h:i:s A', // %I:%M:%S %p
+        '%R' => 'H:i', // %H:%M
+        '%S' => 's',
+        '%T' => 'H:i:s', // %H:%M:%S
+        '%X' => $intl_formatter, // Preferred time representation based on locale, without the date
+
+        // Timezone
+        '%z' => 'O',
+        '%Z' => 'T',
+
+        // Time and Date Stamps
+        '%c' => $intl_formatter,
+        '%D' => 'm/d/Y',
+        '%F' => 'Y-m-d',
+        '%s' => 'U',
+        '%x' => $intl_formatter,
+    ];
+
+    $out = preg_replace_callback('/(?<!%)%([_#-]?)([a-zA-Z])/', function ($match) use ($translation_table, $timestamp) {
+        $prefix = $match[1];
+        $char = $match[2];
+        $pattern = '%'.$char;
+        if ($pattern == '%n') {
+            return "\n";
+        } elseif ($pattern == '%t') {
+            return "\t";
+        }
+
+        if (!isset($translation_table[$pattern])) {
+            throw new InvalidArgumentException(sprintf('Format "%s" is unknown in time format', $pattern));
+        }
+
+        $replace = $translation_table[$pattern];
+
+        if (is_string($replace)) {
+            $result = $timestamp->format($replace);
+        } else {
+            $result = $replace($timestamp, $pattern);
+        }
+
+        switch ($prefix) {
+            case '_':
+                // replace leading zeros with spaces but keep last char if also zero
+                return preg_replace('/\G0(?=.)/', ' ', $result);
+            case '#':
+            case '-':
+                // remove leading zeros but keep last char if also zero
+                return preg_replace('/^0+(?=.)/', '', $result);
+        }
+
+        return $result;
+    }, $format);
+
+    $out = str_replace('%%', '%', $out);
+    return $out;
+}