title: Running cron job at only specific date and time
body: <p>In our express js application have a feature in admin module that he can send mail to users at specific dates (he can able to select a specific date and time).</p>
  
  <p>Say if the date and time is 2018-02-22@12.00  we need to run the email code at that time.</p>
  
  <p>I think this package will full fill our needs <a href="https://www.npmjs.com/package/node-schedule" rel="nofollow noreferrer">https://www.npmjs.com/package/node-schedule</a>,</p>
  
  <p>Here is their documentation</p>
  
  <pre><code>*    *    *    *    *    *
  ┬    ┬    ┬    ┬    ┬    ┬
  │    │    │    │    │    │
  │    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
  │    │    │    │    └───── month (1 - 12)
  │    │    │    └────────── day of month (1 - 31)
  │    │    └─────────────── hour (0 - 23)
  │    └──────────────────── minute (0 - 59)
  └───────────────────────── second (0 - 59, OPTIONAL)
  </code></pre>
  
  <p>But it doesn't say how to run on specific date (year field is missing??) so how do i achieve my need?</p>