How can I changed the timezone of nios2 linux?

[Altera_Forum]

hi all: 

 I execed ntpdate on nios2-linux.It's work fine. My nios2-linux can synch net time  server. But I meet a question. My nios2-linux time zone is MST. I am not find the  "local time" file in /etc .So I copy the "local time" file in the /etc. But after exec   ntpdate, my system time still synch with MST time, not synch time with time zone of the /etc/local time file.  How can I changed the timezone of nios2 linux?  Thanks

[Altera_Forum]

search /etc/TZ in this file, 

http://uclibc.org/downloads/glibc_vs_uclibc_differences.txt (http://uclibc.org/downloads/glibc_vs_uclibc_differences.txt)