[BUG] - Nightly job run twice

[wandering-tales]

Describe the bug

It seems this long standing issue (see #52, #132, #159, and #601) is still unresolved.

I have configured a daily job running at 3:00, which processes a batch of entities relevant to my domain. The job completes in around 170ms:

_, _ = scheduler.NewJob(
		gocron.DailyJob(1, gocron.NewAtTimes(gocron.NewAtTime(3, 0, 0))),
		gocron.NewTask(task.MyTask, myParam1, myParam2),
		gocron.WithEventListeners(
			gocron.AfterJobRunsWithError(func(jobID uuid.UUID, jobName string, err error) {
				log.Printf("failed my task: %v", err)
			})),
)

but this occurred last night:

2024-10-22T03:00:00.245294425Z stderr F 2024/10/22 03:00:00 processing thing with ID 59e50053-0d33-4729-9732-9e69ade399a2
...
2024-10-22T03:00:00.414909773Z stderr F 2024/10/22 03:00:00 processing thing with ID 59e50053-0d33-4729-9732-9e69ade399a2

Version

• gocron: 2.12.1

Expected behavior

The task should be run only once.

Additional context

I have tested the scheduler behavior locally and the NextRuns method of the job returned what is expected.

[rsvix]

Hello, I'm facing the same issue, but using Gocron version 2.5.0.
It's completely random; some days it happens, some it doesn't.
example:

j, _ := sched.NewJob( gocron.CronJob("0 8 ? * MON,TUE,WED,THU,FRI", false), gocron.NewTask( func() { log.Println("doing stuff") }, ), gocron.WithTags("myCustomTag"), gocron.WithSingletonMode(gocron.LimitModeReschedule), )

EDIT: Since I am using Gocron to add jobs to a queue, I was able to temporarily fix this by adding a constraint to the queue to not accept duplicate inputs created at the exact same timestamp.