fix: run once when actual date is given to setTime (kelektiv#740)

src/job.ts

@@ -16,7 +16,6 @@ export class CronJob<OC extends CronOnCompleteCommand | null = null, C = null> {
 	running = false;
 	unrefTimeout = false;
 	lastExecution: Date | null = null;
-	runOnce = false;
 	context: CronContext<C>;
 	onComplete?: WithOnComplete<OC> extends true
 		? CronOnCompleteCallback
@@ -84,10 +83,6 @@ export class CronJob<OC extends CronOnCompleteCommand | null = null, C = null> {
 			) as WithOnComplete<OC> extends true ? CronOnCompleteCallback : undefined;
 		}
 
-		if (this.cronTime.realDate) {
-			this.runOnce = true;
-		}
-
 		this.addCallback(this._fnWrap(onTick));
 
 		if (runOnInit) {
@@ -181,7 +176,9 @@ export class CronJob<OC extends CronOnCompleteCommand | null = null, C = null> {
 		}
 		const wasRunning = this.running;
 		this.stop();
+
 		this.cronTime = time;
+
 		if (wasRunning) this.start();
 	}
 
@@ -258,7 +255,7 @@ export class CronJob<OC extends CronOnCompleteCommand | null = null, C = null> {
 				this.running = false;
 
 				// start before calling back so the callbacks have the ability to stop the cron job
-				if (!this.runOnce) {
+				if (!this.cronTime.realDate) {
 					this.start();
 				}
 

src/time.ts

@@ -684,7 +684,7 @@ export class CronTime {
 		return true;
 	}
 
-	/*
+	/**
 	 * Parse the cron syntax into something useful for selecting the next execution time.
 	 *
 	 * Algorithm:
@@ -733,7 +733,7 @@ export class CronTime {
 		}
 	}
 
-	/*
+	/**
 	 * Parse individual field from the cron syntax provided.
 	 *
 	 * Algorithm:

tests/cron.test.ts

@@ -1080,6 +1080,29 @@ describe('cron', () => {
 			job.stop();
 			expect(callback).toHaveBeenCalledTimes(1);
 		});
+
+		it('should create recurring job, setTime with actual date, start and run once (#739)', () => {
+			const callback = jest.fn();
+			const clock = sinon.useFakeTimers();
+
+			const job = new CronJob('0 0 20 * * *', callback);
+
+			const startDate = new Date(Date.now() + 5000);
+			job.setTime(new CronTime(startDate));
+
+			job.start();
+
+			clock.tick(5000);
+
+			expect(callback).toHaveBeenCalledTimes(1);
+
+			clock.tick(60000);
+
+			clock.restore();
+
+			expect(callback).toHaveBeenCalledTimes(1);
+			expect(job.running).toBe(false);
+		});
 	});
 
 	describe('nextDate(s)', () => {