title: Convert local timestamp to unix epoch timestamp in python
body: <p>i have date string in below format(given in input) of local Asia/Calcutta timezone with(GMT+05:30) i want to convert it to gmt timezone and find epoch timestamp of that string.</p>
  
  <p><strong>Input</strong> : (in Local Time)
    <strong>2019-11-09 10:10:10</strong></p>
  
  <p><strong>Output</strong> : (in GMT Time)
     <strong>1573274410</strong></p>