PHP DateTimeImmutable __construct() Method

The PHP DateTimeImmutable::__construct() method returns a new DateTimeImmutable object. The date_create_immutable() function is an alias of this method.

Unlike DateTime object, this object does not allows any modifications, it creates a new object in case of changes and returns it. By default, this method creates an object of the current date/time.

Syntax

//Object-oriented style
public DateTimeImmutable::__construct(datetime, timezone)

//Procedural style
date_create_immutable(datetime, timezone)

Parameters

`datetime`	`Optional.` Specify a date/time string. It should be in valid Date and Time Formats. If omitted or null, indicates the current time. Default is the current time.
`timezone`	`Optional.` Specify a DateTimeZone object representing the timezone of datetime. If omitted or null, the current timezone will be used. Default is the current timezone. Note: The parameter and the current timezone are ignored when the datetime parameter is either a UNIX timestamp or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00).

Return Value

Returns a new DateTimeImmutable object. Procedural style returns false on failure.

Exceptions

Emits Exception in case of an error.

Example: using both styles

The example below shows the usage of DateTimeImmutable::__construct() method.

<?php
  //datetime string
  $datetime_string = "14-Dec-2015";

  //creating a DateTimeImmutable object using object-oriented style
  $date1 = new DateTimeImmutable($datetime_string);

  //creating a DateTimeImmutable object using procedural style
  $date2 = date_create_immutable($datetime_string);

  //formatting the datetime to print it
  echo $date1->format("Y/m/d H:i:s")."\n";
  echo $date2->format("Y-m-d H:i:s")."\n";
?>

The output of the above code will be:

2015/12/14 00:00:00
2015-12-14 00:00:00

Example: using current time and timezone

When parameters are omitted or null, it indicates the current time and timezone.

<?php
  //creating a DateTimeImmutable object using 
  //current time and timezone
  $date = new DateTimeImmutable();

  //formatting the datetime to print it
  echo $date->format("Y/m/d H:i:s")."\n";

  //formatting date and time separately
  echo $date->format("Y/m/d")."\n";
  echo $date->format("H:i:s")."\n";
?>

The output of the above code will be:

2021/09/09 12:00:56
2021/09/09
12:00:56

Example: using timezone parameter

The example below describes how to use timezone parameter with this method.

<?php
  //datetime string
  $datetime_string = "14-Dec-2015, 10:45:32";

  //DateTimeZone object
  $tz = new DateTimeZone('America/Chicago');

  //creating a DateTimeImmutable object
  $date = new DateTimeImmutable($datetime_string, $tz);

  //formatting the datetime to print it
  echo $date->format("Y/m/d H:i:s P")."\n";
?>

The output of the above code will be:

2015/12/14 10:45:32 -06:00

❮ PHP Date and Time Reference