Cron Expression for Every 12 Hours

import cron from 'node-cron';

cron.schedule('0 */12 * * *', () => {
  console.log('Running task...');
});

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

sched = BlockingScheduler()
sched.add_job(task, CronTrigger.from_crontab('0 */12 * * *'))

name: Scheduled task

on:
  schedule:
    - cron: '0 */12 * * *'

jobs:
  run:
    runs-on: ubuntu-latest
    steps:
      - run: echo "Running task..."

GitHub Actions evaluates scheduled workflows in UTC.

0 */12 * * * /usr/local/bin/backup.sh >> /var/log/cron.log 2>&1

import { Schedule } from 'aws-cdk-lib/aws-events';

new Schedule(this, 'Task', {
  schedule: Schedule.expression('cron(0 0/12 ? * * *)'),
});

Converted to the AWS EventBridge 6-field cron() syntax, which evaluates in UTC and requires '?' in one of the two day fields.