To check your server's current timezone
root@projectx:/sites# date +%Z
EDT
To change
root@projectx:/sites# dpkg-reconfigure tzdata
Asks to select your country/continent first and then city
Current default time zone: 'Asia/Kolkata'
Local time is now: Wed Aug 13 22:20:12 IST 2014.
Universal Time is now: Wed Aug 13 16:50:12 UTC 2014.
root@projectx:/sites# date +%Z
IST