How I can execute a command at a specific date and time in laravel 5.8?

Question

Ι need to be able rto scedule a command to run in specific date and time.

I have the following doomsday nuking command:

<?php

namespace App\Console\Commands;

class DommdayCommand extends Command
{

  protected $signature='nuke:country {commander} {country} ';
  protected $description="Nuke a country";

  public function handle()
  {
    $dictator= $this->argument('commander');
    $country= $this->argument('country');

    $this->output("Nuking the {$country} from {$dictator} ");
  }
}

And I have a specific schedule:

Kim Young Un will nuke Amerika at 2021-06-12 13:00
Osama Bin laden's clone will nuke Amerika at 2021-06-15 18:00
Adolf Hitler's clone will nuke Israel at 2021-06-15 06:00
...

So how I can write date-specific schedules that will execute a specific command at a specific date and time only once? The existing documentation allows me to schedule a command that will be executed continioucly at a specific date and time, for example every hour or every day.

So how I can specify a specific date that will be executed.

Existing cron() function allows me to controll the execution on hour,minute,month,day and day of week. But it does not allow me to specify the year of execution. In my case the year of execution is also important as well. (We do not want to re-nuke an already nuked country from a specific commander also nuking in the next year also not viable as well).

For example if I specify the following in my Kernel.php :

  $schedule->command(DommdayCommand::class)->cron('13 00 15 02 *')

Will execute the command at 2021-02-15 13:00 but also will execute the command at 2022-02-15 13:00 witch I do not want to. I only want to be executed at 2021-02-15 13:00 and never to be executed again.

Answer 1

In accordante to documentation you can use cron to check the:

• month
• day
• hour
• minute

Of execution upon a console command. Thout it may cause to run every month date hout and minut you specify on cron but you can call a closure as seen in this pice of documentation . Therefore you cvan use a closure you the year check at Kernel.php .

use Carbon\Carbon;
use Illuminate\Support\Facades\Artisan


class Kernel extends ConsoleKernel
{
  
  // Sopme code exists here
  
  protected function schedule(Schedule $schedule): void
  {

      // Rest of schedules

       $schedule->call(function () {
               $year = Carbon::now()->y;
               if($year == 2021){
                  Artisan::call('nuke:country "Kim Young Un" Amerika');
                }
        })->cron('13 00 12 06 *');


      // More schedules

  }

  // Rest of code here
}

Therefore use a closaure to check for the year and then if year is the appropriate one then call the code whilst on cron expression you check for month, day, hour and minute of execution.

An alternative approach is to let the closure handle it all:

$schedule->call(function () {

  $dates=[
    '2021-06-12 13:00' => [
       'commander'=>'Kim Young Un',
       'country'  => 'America'
     ],
     '2021-06-15 18:00' => [
       'commander'=>'Osama Bin Laden's clone',
       'country'  => 'America'
     ],
     '2021-06-15 06:00' => [
       'commander'=>'Adolf Hitler's clone',
       'country'  => 'Israel'
     ],
  ];  

  $date = Carbon::now()->format('Y-m-d H:i:s');
  
  if(isset($dates[$date])){
     $params=$dates[$date];
     Artisan::call("nuke:country \"{$params['commander']}\" {$params['country']}");
  }
})->cron('*****');

In other words execute the command on appropriate dates and continiouly check execution date is the appropriate.