title: shell scripts to increment time in --rfc-3339 format
body: <p>I want to increment time in -rfc-3339 format and have used following command :</p>
  
  <pre><code>`date --date="(date --rfc-3339=seconds) + 5 minutes"` 
  </code></pre>
  
  <p>but after increment current time by 5 minutes, it shows the incremented system time in standard format :</p>
  
  <p><code>Thu Feb  2 20:06:30 IST 2017</code>. </p>
  
  <p>I want the desired output in <code>--rfc-3339</code> format i.e </p>
  
  <p><code>2017-02-02 20:06:30+05:30</code>. </p>
  
  <p>Thanks in advance.</p>