use "standalone" names for month and day. fixes #12

src/php-8.1-strftime.php

@@ -44,9 +44,9 @@ function strftime (string $format, $timestamp = null, ?string $locale = null) :
     $locale = Locale::canonicalize($locale ?? setlocale(LC_TIME, '0'));
 
     $intl_formats = [
-      '%a' => 'EEE',	// An abbreviated textual representation of the day	Sun through Sat
+      '%a' => 'ccc',	// 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' => 'LLL',	// 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
     ];