codeigniter get time zone offset

i need to get the timezone offset value from the timezone data in codeigniter.开发者_如何学运维 Timezones i have are UM12, UM11, .... UTC.... UP10 UP11 UP12..... i need exact offset values. is there any direct method?

$this->load->helper('date');

echo timezone('UM10'); //  will give -10

or try

print_r(timezone()); // List the entire timezone array

Hope this will help ;)