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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HelloWorld {
  public static void main(String[] args) {
    Logger logger = LoggerFactory.getLogger(HelloWorld.class);
    logger.info("Hello World");
  }
}

References :
http://www.slf4j.org/manual.html

Seconds diff = Seconds.secondsBetween(start, end);

Or

Period diff = new Period(start, end);

References :
http://stackoverflow.com/questions/15814911/how-to-subtract-two-joda-datetimes

isAfter and isBefore methods compare dates by millis (ignoring time zone).

System.out.println(londonDT.getMillis() == estDT.getMillis());

will print true.

londonDT.isBefore(estDT) 
londonDT.isAfter(estDT)

are equal to

londonDT.getMillis() < estDT.getMillis()  
londonDT.getMillis() > estDT.getMillis()

References :
http://stackoverflow.com/questions/17172782/comparing-two-joda-time-datetime-objects

There are two ways to pass an object that can be retrieved when a Quartz job executes:

Pass the instance in the data map. When you set the job up, add your instance to the map with a key like this:

// Create job etc...
var MyClass _myInstance;
statusJob.JobDataMap.Put("myKey", _myInstance);
// Schedule job...

Retrieve the instance in the job’s Execute() method like this:

public void Execute(IJobExecutionContext context)
        {
            var dataMap = context.MergedJobDataMap;
            var myInstance = (MyClass)dataMap["myKey"];
        }

OR

Add the instance to the scheduler context when you set the job up, like this:

  ISchedulerFactory schedFact = new StdSchedulerFactory();
  _sched = schedFact.GetScheduler();
  _sched.Start();
  // Create job etc...
  var MyClass _myInstance;
  _sched.Context.Put("myKey", myInstance);
  // Schedule job...

Retrieve the instance in the job’s Execute() method like this:

public void Execute(IJobExecutionContext context)
        {
            var schedulerContext = context.Scheduler.Context;
            var myInstance = (MyClass)schedulerContext.Get("myKey");
        }

References :
http://stackoverflow.com/questions/7137960/quartz-scheduler-how-to-pass-custom-objects-as-jobparameter

        DateTime dateTime=new DateTime();
        dateTime =dateTime.plusMinutes(1);

        JobDetail job= JobBuilder.newJob(Task1.class).withIdentity("job1","group1").build();

        System.out.println(job.getKey().toString());

        SimpleTrigger trigger= (SimpleTrigger) TriggerBuilder.newTrigger()
                .withIdentity("trigger1","group1")
                .startAt(dateTime.toDate())
                .build();


        System.out.println(String.format("Start : %s",new DateTime().toString()));
        Scheduler scheduler = new StdSchedulerFactory().getScheduler();
        scheduler.start();
        scheduler.scheduleJob(job, trigger);

        System.out.println(scheduler.checkExists(new JobKey("job1","group1")));

References :
http://stackoverflow.com/questions/26523285/checking-if-the-job-exists-without-looping-through-all-the-jobs