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Carbon 

What is Carbon, and how is it used in PHP?
How can you include the Carbon library in a PHP project?
What is composer.lock file used for?

Carbon

An international PHP extension for DateTime. composer require nesbot/carbon 
 
require __DIR__ . '/vendor/autoload.php';

use Carbon\Carbon;

/**
 * next
 */
$now = Carbon::now();
$dt = Carbon::parse($now);
echo $dt->hour . "\n";

$date = $now->add(1, 'day');
echo $date->isoFormat('dddd D') . "\n"; 
    // Tuesday 29
    
$date = $now->add(1, 'month');
echo $date->isoFormat('YYYY-MM-DD') . "\n"; 
    // 2022-04-29

/**
 * timezone
 */
$now = Carbon::now();
$dt = Carbon::parse($now);
echo $dt->timezone . "\n"; 
    // Europe/Helsinki
echo $dt->hour . "\n";
    // 16

$nowLondon = Carbon::now('Europe/London');
$dt = Carbon::parse($nowLondon);
echo $dt->hour  . "\n"; 
    // 14

DateTime

Date and time from the server where your PHP scripts are running. 
 
// Add time to get a future date

$date = new DateTime();
$format = "Y-m-d";

echo $date->format($format) . "\n";
    # 2021-12-20

$date->modify("+12 days");
echo $date->format($format) . "\n";
    # 2021-01-01

$date->modify("+31 days");
echo $date->format($format) . "\n";
    # 2021-02-01

$date->modify("+31 days");
echo $date->format($format) . "\n";
    # 2021-03-04

Outdated

To upgrade a specific library, you'll first want to check if an update is needed. Composer will also update the transitive dependencies, but within the constraints (composer.lock). 
 
cd github/php-pages/main/composer/carbon/
composer outdated

    # Direct dependencies required in composer.json:
    # nesbot/carbon                 2.57.0  2.72.1  An API extension for DateTime ...

    # Transitive dependencies not required in composer.json:
    # symfony/polyfill-mbstring     v1.25.0 v1.28.0 Symfony polyfill for the Mbstr...

Update Library

Composer updates to the latest version that satisfies the version constraints in composer.json 
 
# composer.json

    {
        "require": {
            "nesbot/carbon": "^2.72.1"
        }
    }
    
composer update nesbot/carbon

Update

This command updates all project's dependencies to their latest versions (constraints composer.json). It's a broader update and can potentially upgrade multiple packages, not just nesbot/carbon. This can lead to significant changes in your composer.lock file. 
 
composer outdated

    # Direct dependencies required in composer.json:
    # Everything up to date

    # Transitive dependencies not required in composer.json:
    # symfony/polyfill-mbstring     v1.25.0 v1.28.0 Symfony polyfill for the Mbstr...
    # symfony/polyfill-php80        v1.25.0 v1.28.0 Symfony polyfill backporting s...

composer update
composer outdated

    # Direct dependencies required in composer.json:
    # Everything up to date

    # Transitive dependencies not required in composer.json:
    # Everything up to date



  Last update: 90 days ago