Run Monthly Jobs on the 15th at Midnight | CronBase

#!/usr/bin/env bash
# Production-ready crontab entry and execution wrapper
# Install: (crontab -l 2>/dev/null; echo "0 0 15 * * /usr/local/bin/mid_month_job.sh >> /var/log/cron_mid_month.log 2>&1") | crontab -
set -euo pipefail
LOCKFILE="/var/run/mid_month_job.lock"
exec 9>"$LOCKFILE"
if ! flock -n 9; then
    echo "[ERROR] $(date): Job already running or locked." >&2
    exit 1
fi
echo "[INFO] $(date): Starting monthly maintenance job..."
# Core business logic goes here
# /usr/local/bin/run-reconciliation.sh
echo "[INFO] $(date): Job completed successfully."

const cron = require('node-cron');

// Schedule to run at midnight on the 15th of every month
cron.schedule('0 0 15 * *', async () => {
    console.log(`[${new Date().toISOString()}] Starting monthly data reconciliation...`);
    try {
        // Simulate processing logic
        await performMonthlyReconciliation();
        console.log(`[${new Date().toISOString()}] Monthly job executed successfully.`);
    } catch (error) {
        console.error(`[${new Date().toISOString()}] Critical error during monthly job:`, error);
        // Integrate with paging/alerting system here (e.g., PagerDuty, Sentry)
    }
}, {
    scheduled: true,
    timezone: "UTC"
});

async function performMonthlyReconciliation() {
    return new Promise((resolve) => setTimeout(resolve, 5000));
}

import logging
from datetime import datetime
from apscheduler.schedulers.blocking import BlockingScheduler
from apscheduler.triggers.cron import CronTrigger

logging.basicConfig(level=logging.INFO, format='%(asctime)s [%(levelname)s] %(message)s')
logger = logging.getLogger(__name__)

def run_monthly_task():
    logger.info("Starting scheduled mid-month task...")
    try:
        # Core business logic here
        logger.info("Mid-month task completed successfully.")
    except Exception as e:
        logger.error(f"Failed to execute mid-month task: {str(e)}", exc_info=True)

if __name__ == "__main__":
    scheduler = BlockingScheduler()
    # Standard cron 0 0 15 * * maps to: minute=0, hour=0, day=15, month=*, day_of_week=*
    trigger = CronTrigger(minute=0, hour=0, day=15, timezone='UTC')
    scheduler.add_job(run_monthly_task, trigger)
    logger.info("Scheduler initialized. Waiting for execution on the 15th of the month...")
    try:
        scheduler.start()
    except (KeyboardInterrupt, SystemExit):
        logger.info("Scheduler stopped cleanly.")

package main

import (
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/robfig/cron/v3"
)

func main() {
	logger := log.New(os.Stdout, "[CRON] ", log.LstdFlags|log.Lshortfile)
	
	utcLoc, err := time.LoadLocation("UTC")
	if err != nil {
		logger.Fatalf("Failed to load UTC timezone: %v", err)
	}

	c := cron.New(cron.WithLocation(utcLoc))
	
	_, err = c.AddFunc("0 0 15 * *", func() {
		logger.Println("Executing monthly maintenance job...")
		if err := performJob(); err != nil {
			logger.Printf("ERROR: Monthly job failed: %v", err)
		} else {
			logger.Println("Monthly job completed successfully.")
		}
	})
	if err != nil {
		logger.Fatalf("Error scheduling job: %v", err)
	}

	c.Start()
	logger.Println("Scheduler started. Waiting for the 15th...")

	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
	<-sigChan
	
	logger.Println("Shutting down scheduler...")
	c.Stop()
}

func performJob() error {
	time.Sleep(2 * time.Second)
	return nil
}

package com.example.scheduler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MonthlyTaskScheduler {

    private static final Logger logger = LoggerFactory.getLogger(MonthlyTaskScheduler.class);

    // Spring uses a 6-field cron pattern (second, minute, hour, day, month, day-of-week).
    // "0 0 0 15 * *" executes at midnight on the 15th day of every month.
    @Scheduled(cron = "0 0 0 15 * *", zone = "UTC")
    public void executeMidMonthJob() {
        logger.info("Starting mid-month background processing...");
        try {
            processBillingReconciliation();
            logger.info("Mid-month background processing finished successfully.");
        } catch (Exception e) {
            logger.error("Critical error during mid-month scheduled task execution", e);
        }
    }

    private void processBillingReconciliation() throws Exception {
        Thread.sleep(1000);
    }
}

apiVersion: batch/v1
kind: CronJob
metadata:
  name: mid-month-reconciliation
  namespace: default
spec:
  schedule: "0 0 15 * *"
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 5
  startingDeadlineSeconds: 1800
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: worker
            image: registry.example.com/jobs/reconciliation:v1.2.0
            resources:
              requests:
                cpu: "500m"
                memory: "512Mi"
              limits:
                cpu: "1000m"
                memory: "1Gi"
          restartPolicy: OnFailure