DateTime::format()

DateTimeImmutable::format

DateTimeInterface::format

date_format

(PHP 5 >= 5.2.1, PHP 7)

Returns date formatted according to given format

说明

面向对象风格
publicDateTime::format(string $format): stringpublicDateTimeImmutable::format(string $format): stringpublicDateTimeInterface::format(string $format): string过程化风格
date_format(DateTimeInterface$object,string $format): string

Returns date formatted according to given format.

参数

$object

仅为过程化风格：由date_create()返回的DateTime类型的对象。

$format

Format accepted bydate().

返回值

Returns the formatted date string on success 或者在失败时返回FALSE.

范例

Example #1DateTime::format()example

面向对象风格

过程化风格

以上例程会输出：

2000-01-01 00:00:00

注释

This method does not use locales. All output is in English.

参见

• date() 格式化一个本地时间／日期

Using a datetime field from a mysql database e.g. "2012-03-24 17:45:12" 

For full reference of the supported format character and results,
see the documentation of date() :
http://www.php.net/manual/en/function.date.php

Seems like datetime::format does not really support microseconds as the documentation under date suggest it will.
Here is some code to generate a datetime with microseconds and timezone:
private function udate($format = 'u', $utimestamp = null) {
    if (is_null($utimestamp))
      $utimestamp = microtime(true);
    $timestamp = floor($utimestamp);
    $milliseconds = round(($utimestamp - $timestamp) * 1000000);
    return date(preg_replace('`(?
$saved_time="2019-03-09 14:25:20";
  $formated_saved_time = new DateTime($saved_time);
  $current_time = new DateTime();
  $interval = $current_time->diff($formated_saved_time);
 
   if (!empty($interval->format('%a'))){
    $time_difference=$interval->format('%a days ago');
    } elseif ($formated_saved_time->format('d') != $current_time->format('d')){
       $time_difference="yesterday";
       }elseif (!empty($interval->format('%h'))){
           $time_difference=$interval->format('%h hr, %i min ago');
           } elseif (!empty($interval->format('%i'))){
               $time_difference=$interval->format('%i min ago');
               } elseif (!empty($interval->format('%s'))){
                $time_difference=$interval->format('%s sec ago');
 } 
output ----- posted 4 hr, 12 min ago at 2019-03-09 14:25:20
see the code in action here 
https://eval.in/1081921
I believe this is a bug but its note-worthy if it is intended (I am using PHP 5.5.3).
$ php --version
PHP Warning: Module 'xdebug' already loaded in Unknown on line 0
PHP 5.5.3-1ubuntu2.1 (cli) (built: Dec 12 2013 04:24:35) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
  with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans
  with Zend OPcache v7.0.3-dev, Copyright (c) 1999-2013, by Zend Technologies
What is happening:
DateTime() >format() will modify the timezone. So do not expect the public date property to be returned (format mask applied) based on the current public timezone property. format will decide that when calling ->format() it will use the server timezone which eliminates all usefulness of ->setTimezone().

outputs;
$nowUtc
object(DateTime)[2607]
 public 'date' => string '2014-02-13 02:42:48' (length=19)
 public 'timezone_type' => int 3
 public 'timezone' => string 'UTC' (length=3)
$nowUtc->format('Y-m-d h:i:s')
string '2014-02-13 02:42:48' (length=19)
$nowUtc->setTimezone( new \DateTimeZone( 'Australia/Sydney' ) )
object(DateTime)[2608]
 public 'date' => string '2014-02-13 13:42:48' (length=19)
 public 'timezone_type' => int 3
 public 'timezone' => string 'Australia/Sydney' (length=16)
$nowUtc->format('Y-m-d h:i:s')
string '2014-02-13 01:42:48' (length=19) // expected 2014-02-13 13:42:48 based on Australia/Sydney - what is 2014-02-13 01:42:48 from anyway!
 

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