S2OJ/web/app/models/UOJTime.php

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<?php
class UOJTime {
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public static ?DateTime $time_now = null;
public static string $time_now_str = '';
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const FORMAT = 'Y-m-d H:i:s';
const FORMAT_CURRENT_YEAR = 'm-d H:i:s';
const FORMAT_NOT_CURRENT_YEAR = 'Y-m-d H:i';
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const MAX_TIME = '9999-12-31 23:59:59';
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public static function init() {
self::$time_now = new DateTime();
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self::$time_now_str = self::$time_now->format(static::FORMAT);
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}
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public static function str2time($input) {
if (!is_string($input)) {
return null;
}
try {
$time = new DateTime($input);
if ($time->format(static::FORMAT) !== $input) {
return null;
}
return $time;
} catch (Exception $e) {
return null;
}
}
public static function time2str(DateTime $time) {
return $time->format(static::FORMAT);
}
/**
* @var DateTime|string $time
*/
public static function userFriendlyFormat($time) {
try {
if (!($time instanceof DateTime)) {
$time = new DateTime($time);
}
if ($time->format('Y') === self::$time_now->format('Y')) {
return $time->format(static::FORMAT_CURRENT_YEAR);
} else {
return $time->format(static::FORMAT_NOT_CURRENT_YEAR);
}
} catch (Exception $e) {
return '';
}
}
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}