title: How to get local time from UST in flutter
body: <p>I am making an app using flutter, dart.<br>
  I am using some api to get sunrise time using longitude and latitude.<br>
  But the data I get is in UST time zone.<br>
  I want to convert it to local time zone.<br><br></p>
  
  <p>In short I have location and I want to convert time to local time.<br><br></p>
  
  <p>eg. I have time <strong>"3:02:32 PM"</strong> which is in <strong>UST</strong> and I have <strong>location</strong> (say India which is +5:30) so I want to get time which will be in this case <strong>"8:32:32 PM"</strong></p>