Hướng dẫn php datetime set time

Question

date_timezone_set

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

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date_timezone_set
Return Values
date_time_set
Description
Return Values
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date_modify
Description
Return Values

DateTime::setTimezone -- date_timezone_set — Sets the time zone for the DateTime object

Parameters

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

timezone

A DateTimeZone object representing the desired time zone.

Return Values

Returns the DateTime object for method chaining. The underlaying point-in-time is not changed when calling this method.

Examples

Example #1 DateTime::setTimeZone() example

Object-oriented style

<?php $date = new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru')); echo $date->format('Y-m-d H:i:sP') . "\n";$date->setTimezone(new DateTimeZone('Pacific/Chatham')); echo $date->format('Y-m-d H:i:sP') . "\n"; ?>

Procedural style

<?php $date = date_create('2000-01-01', timezone_open('Pacific/Nauru')); echo date_format($date, 'Y-m-d H:i:sP') . "\n";date_timezone_set($date, timezone_open('Pacific/Chatham')); echo date_format($date, 'Y-m-d H:i:sP') . "\n"; ?>

The above examples will output:

2000-01-01 00:00:00+12:00
2000-01-01 01:45:00+13:45

date_time_set

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

DateTime::setTime -- date_time_set — Sets the time

Description

Object-oriented style

public DateTime::setTime(
    int $hour,
    int $minute,
    int $second = 0,
    int $microsecond = 0
): DateTime

Like DateTimeImmutable::setTime() but works with DateTime.

The procedural version takes the DateTime object as its first argument.

Parameters

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

hour

Hour of the time.

minute

Minute of the time.

second

Second of the time.

microsecond

Microsecond of the time.

Return Values

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

Changelog

Version	Description
8.1.0	The behaviour with double existing hours (during the fall-back DST transition) changed. Previously PHP would pick the second occurrence (after the DST transition), instead of the first occurrence (before DST transition).
7.1.0	The `microsecond` parameter was added.

I am trying to add 1 hour to a timestamp field fetched from database using the following code.

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date_modify
Description
Return Values

date($ls['created_at'], strtotime('+1 hour'));

However, this doesn't seem to work. It returns the same time as in database. Am I missing something? Or, is the code deprecated? What is the proper solution?

asked Sep 12, 2021 at 21:57

1

You need to give it the correct syntax to use this, You need to send the time to change with the change itself in the function - for example (using date for wanted format):

$date = "22-02-2021 14:22:22";
echo date("d-m-Y H:i:s", strtotime($date.' +1 hour'));

This will return:

22-02-2021 15:22:22

Same as this:

echo date("d-m-Y H:i:s", strtotime("22-02-2021 14:22:22 + 1 hour"));

The idea is that you strtotime receives the date and data to change in one string like this :

echo strtotime("22-02-2021 14:22:22 + 2 hour");

Will return:

1614010942

Here I removed the Date Format so I received a unix timestamp format

answered Sep 12, 2021 at 22:07

ShlomtzionShlomtzion

6565 silver badges12 bronze badges

3

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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

<?php $date = new DateTime('2006-12-12'); $date->modify('+1 day'); echo $date->format('Y-m-d'); ?>

Procedural style

<?php $date = date_create('2006-12-12'); date_modify($date, '+1 day'); echo date_format($date, 'Y-m-d'); ?>

The above examples will output:

Example #2 Beware when adding or subtracting months

<?php $date = new DateTime('2000-12-31');$date->modify('+1 month'); echo $date->format('Y-m-d') . "\n";$date->modify('+1 month'); echo $date->format('Y-m-d') . "\n"; ?>