Cron Expression for the First Day of Every Month

# At 00:00 on the 1st of every month
0 0 1 * * /path/to/your/script.sh

name: Scheduled Job
on:
  schedule:
    - cron: '0 0 1 * *'
jobs:
  run:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: echo "Running First Day of Every Month"

[Unit]
Description=First Day of Every Month timer

[Timer]
OnCalendar=*-*-* *:*:00
Persistent=true

[Install]
WantedBy=timers.target

import cron from 'node-cron'

// At 00:00 on the 1st of every month
cron.schedule('0 0 1 * *', () => {
  console.log('Running First Day of Every Month')
})

// At 00:00 on the 1st of every month
@Scheduled(cron = "0 0 0 1 * *")
public void run() {
    // your task
}