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    The DateTimeImmutable class

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

    Introduction

    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.

    Class synopsis

    class DateTimeImmutable implements DateTimeInterface {
    /* Inherited constants */
    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";
    /* Methods */
    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
    }

    Changelog

    Version Description
    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.

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