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The DateTime class

[PHP 5 >= 5.2.0, PHP 7, PHP 8]

Introduction

Representation of date and time.

This class behaves the same as DateTimeImmutable except objects are modified itself when modification methods such as DateTime::modify[] are called.

Warning

Calling methods on objects of the class DateTime will change the information encapsulated in these objects, if you want to prevent that you will have to use clone operator to create a new object. Use DateTimeImmutable instead of DateTime to obtain this recommended behaviour by default.

Class synopsis

public setTime[
    int $hour,
    int $minute,
    int $second = 0,
    int $microsecond = 0
]: DateTime

public format[string $format]: string

}

Changelog

Table of Contents

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

date_modify

[PHP 5 >= 5.2.0, PHP 7, PHP 8]

DateTime::modify -- date_modify — Alters the timestamp

Description

Object-oriented style

public DateTime::modify[string $modifier]: DateTime|false

Return Values

Returns the modified DateTime object for method chaining or false on failure.

Examples

Example #1 DateTime::modify[] example

Object-oriented style

Procedural style

The above examples will output:

Example #2 Beware when adding or subtracting months

The above example will output:

See Also

• strtotime[] - Parse about any English textual datetime description into a Unix timestamp
• DateTimeImmutable::modify[] - Creates a new object with modified timestamp
• DateTime::add[] - Modifies a DateTime object, with added amount of days, months, years, hours, minutes and seconds
• DateTime::sub[] - Subtracts an amount of days, months, years, hours, minutes and seconds from a DateTime object
• DateTime::setDate[] - Sets the date
• DateTime::setISODate[] - Sets the ISO date
• DateTime::setTime[] - Sets the time
• DateTime::setTimestamp[] - Sets the date and time based on an Unix timestamp