*/
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()));
}
$locale = Locale::canonicalize($locale ?? (Locale::getDefault() ?? setlocale(LC_TIME, '0')));
$intl_formats = [
'%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' => '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
];
$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.
$calendar = IntlGregorianCalendar::createInstance();
// NOTE: IntlGregorianCalendar::createInstance DOES NOT return an IntlGregorianCalendar instance when
// using a non-Gregorian locale (e.g. fa_IR)! In that case, setGregorianChange will not exist.
if ($calendar instanceof IntlGregorianCalendar) {
$calendar->setGregorianChange(PHP_INT_MIN);
}
return (new IntlDateFormatter($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,
];
$out = preg_replace_callback('/(?format($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\s]+(?=.)/', '', $result);
}
return $result;
}, $format);
$out = str_replace('%%', '%', $out);
return $out;
}