# The DateTimeImmutable class

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

## 简介

Representation of date and time.

This class behaves the same as DateTime except new objects are returned when modification methods such as DateTime::modify() are called.

## 类摘要

class DateTimeImmutable implements DateTimeInterface {
/* 继承的常量 */
public const string DateTimeInterface::ATOM = "Y-m-d\\TH:i:sP";
public const string DateTimeInterface::COOKIE = "l, d-M-Y H:i:s T";
public const string DateTimeInterface::ISO8601 = "Y-m-d\\TH:i:sO";
public const string DateTimeInterface::ISO8601_EXPANDED = "X-m-d\\TH:i:sP";
public const string DateTimeInterface::RFC822 = "D, d M y H:i:s O";
public const string DateTimeInterface::RFC850 = "l, d-M-y H:i:s T";
public const string DateTimeInterface::RFC1036 = "D, d M y H:i:s O";
public const string DateTimeInterface::RFC1123 = "D, d M Y H:i:s O";
public const string DateTimeInterface::RFC7231 = "D, d M Y H:i:s \\G\\M\\T";
public const string DateTimeInterface::RFC2822 = "D, d M Y H:i:s O";
public const string DateTimeInterface::RFC3339 = "Y-m-d\\TH:i:sP";
public const string DateTimeInterface::RFC3339_EXTENDED = "Y-m-d\\TH:i:s.vP";
public const string DateTimeInterface::RSS = "D, d M Y H:i:s O";
public const string DateTimeInterface::W3C = "Y-m-d\\TH:i:sP";
/* 方法 */
public __construct(string `$datetime` = "now", ?DateTimeZone `$timezone` = `null`)
#[\NoDiscard]
public add(DateInterval `$interval`): DateTimeImmutable
public static createFromFormat(string `$format`, string `$datetime`, ?DateTimeZone `$timezone` = `null`): DateTimeImmutable|false
public static createFromInterface(DateTimeInterface `$object`): DateTimeImmutable
public static createFromMutable(DateTime `$object`): static
public static getLastErrors(): array|false
#[\NoDiscard]
public modify(string `$modifier`): DateTimeImmutable
public static __set_state(array `$array`): DateTimeImmutable
#[\NoDiscard]
public setDate(int `$year`, int `$month`, int `$day`): DateTimeImmutable
#[\NoDiscard]
public setISODate(int `$year`, int `$week`, int `$dayOfWeek` = 1): DateTimeImmutable
#[\NoDiscard]
public setTime(
int `$hour`,
int `$minute`,
int `$second` = 0,
int `$microsecond` = 0
): DateTimeImmutable
#[\NoDiscard]
public setTimestamp(int `$timestamp`): DateTimeImmutable
#[\NoDiscard]
public setTimezone(DateTimeZone `$timezone`): DateTimeImmutable
#[\NoDiscard]
public sub(DateInterval `$interval`): DateTimeImmutable
public diff(DateTimeInterface `$targetObject`, bool `$absolute` = `false`): DateInterval
public format(string `$format`): string
public getOffset(): int
public getTimestamp(): int
public getTimezone(): DateTimeZone|false
public __serialize(): array
public __unserialize(array `$data`): void
#[\Deprecated]
public __wakeup(): void
}

## 更新日志

版本 | 说明
--- | ---
8.4.0 | The class constants are now typed.
7.1.0 | The DateTimeImmutable constructor now includes the current microseconds in the constructed value. Before this, it would always initialise the microseconds to `0`.

## 目录

- DateTimeImmutable::add — Returns a new object, with added amount of days, months, years, hours, minutes and seconds
- DateTimeImmutable::__construct — Returns new DateTimeImmutable object
- DateTimeImmutable::createFromFormat — Parses a time string according to a specified format
- DateTimeImmutable::createFromInterface — Returns new DateTimeImmutable object encapsulating the given DateTimeInterface object
- DateTimeImmutable::createFromMutable — Returns new DateTimeImmutable instance encapsulating the given DateTime object
- DateTimeImmutable::getLastErrors — Returns the warnings and errors
- DateTimeImmutable::modify — Creates a new object with modified timestamp
- DateTimeImmutable::__set_state — The __set_state handler
- DateTimeImmutable::setDate — Sets the date
- DateTimeImmutable::setISODate — Sets the ISO date
- DateTimeImmutable::setTime — Sets the time
- DateTimeImmutable::setTimestamp — Sets the date and time based on a Unix timestamp
- DateTimeImmutable::setTimezone — Sets the time zone
- DateTimeImmutable::sub — Subtracts an amount of days, months, years, hours, minutes and seconds

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