(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::__construct -- date_create_immutable — Returns new DateTimeImmutable object
面向对象风格
$datetime = "now", ? DateTimeZone $timezone = null )过程化风格
$datetime = "now", ? DateTimeZone $timezone = null ): DateTimeImmutable |false Returns new a DateTimeImmutable object.
datetime日期/时间字符串。正确格式的说明详见 日期与时间格式。
Enter"now" here to obtain the current time when using
the timezone parameter.
timezonedatetime.
If timezone is omitted or null ,
the current timezone will be used.
注意: The
timezoneparameter and the current timezone are ignored when thedatetimeparameter either is a UNIX timestamp (e.g.@946684800) or specifies a timezone (e.g.2010年01月28日T15:00:00+02:00, or2010年07月05日T06:00:00Z).
Returns a new DateTimeImmutable instance.
If an invalid Date/Time string is passed, DateMalformedStringException is thrown. Previous to PHP 8.3, this was Exception .
| 版本 | 说明 |
|---|---|
| 8.3.0 | Now throws DateMalformedStringException if an invalid string is passed, instead of Exception . |
| 7.1.0 | From now on microseconds are filled with actual value. Not with '00000'. |
示例 #1 DateTimeImmutable::__construct() example
面向对象风格
<?php
try {
$date = new DateTimeImmutable('2000-01-01');
} catch (Exception $e) {
echo $e->getMessage();
exit(1);
}
echo $date->format('Y-m-d');以上示例会输出:
2000年01月01日
过程化风格
<?php
$date = date_create('2000-01-01');
if (!$date) {
$e = date_get_last_errors();
foreach ($e['errors'] as $error) {
echo "$error\n";
}
exit(1);
}
echo date_format($date, 'Y-m-d');以上示例会输出:
2000年01月01日
示例 #2 Intricacies of DateTimeImmutable::__construct()
<?php
date_default_timezone_set('America/Jamaica');
// Specified date/time in PHP's default time zone.
$date = new DateTimeImmutable('2000-01-01');
echo $date->format('Y-m-d H:i:sP') . "\n";
// Specified date/time in the specified time zone.
$date = new DateTimeImmutable('2000-01-01', new DateTimeZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "\n";
// Current date/time in your PHP's default time zone.
$date = new DateTimeImmutable();
echo $date->format('Y-m-d H:i:sP') . "\n";
// Current date/time in the specified time zone.
$date = new DateTimeImmutable('now', new DateTimeZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "\n";
// Using a UNIX timestamp. Notice the result is in the UTC time zone.
$date = new DateTimeImmutable('@946684800');
echo $date->format('Y-m-d H:i:sP') . "\n";
// Non-existent values roll over.
$date = new DateTimeImmutable('2000-02-30');
echo $date->format('Y-m-d H:i:sP') . "\n";以上示例的输出类似于:
2000年01月01日 00:00:00-05:00 2000年01月01日 00:00:00+12:00 2010年04月24日 10:24:16-04:00 2010年04月25日 02:24:16+12:00 2000年01月01日 00:00:00+00:00 2000年03月01日 00:00:00-05:00
注意:
Rolled over dates can be detected by checking for warnings using DateTimeImmutable::getLastErrors() .
示例 #3 Changing the associated timezone
<?php
$timeZone = new \DateTimeZone('Asia/Tokyo');
$time = new \DateTimeImmutable();
$time = $time->setTimezone($timeZone);
echo $time->format('Y/m/d H:i:s e'), "\n";以上示例的输出类似于:
2022年08月12日 23:49:23 Asia/Tokyo
示例 #4 Using a relative date/time string
<?php
$time = new \DateTimeImmutable("-1 year");
echo $time->format('Y/m/d H:i:s'), "\n";以上示例的输出类似于:
2021年08月12日 15:43:51
"If $timezone is omitted or null, the current timezone will be used." - note, that timezone IS NOT equal offset, if its important for your application.
If default timezone = Europe/Moscow, then:
echo (new \DateTimeImmutable('2014-10'))->format(DATE_ATOM); // gives "2014-10-01T00:00:00+04:00"
echo (new \DateTimeImmutable('2014-11'))->format(DATE_ATOM); // gives "2014-11-01T00:00:00+03:00"
because of law changes (abolition of "summer time").