Shell Programming and Scripting

Hi everybody,
I have a task on my hands, the goal of the task is to overwrite the time zone information for the linux OS, I have searched and found that the this data is stored in the file /etc/localtime, the thing I want to ask about is the structure of the file as described in the tzfile manual page, I have read it all many times but I could not understand for what each member of the file stands for and the meaning of it, for example the following variables what is the meaning for each and what value should be filled with, as in the first one: UTC/local indicator ???, I did not understand it and so for the following others, could anybody be of help to me and explain the things that I do not understand and if possible provide me with some c code that could create a file with such specifics.
tzh_ttisgmtcnt
The number of UTC/local indicators stored in the file.

tzh_ttisstdcnt
The number of standard/wall indicators stored in the file.

tzh_leapcnt
The number of leap seconds for which data is stored in the file.

tzh_timecnt
The number of "transition times" for which data is stored in the
file.

tzh_typecnt
The number of "local time types" for which data is stored in the
file (must not be zero).

tzh_charcnt
The number of characters of "timezone abbreviation strings"
Thanks for all the efforts.

Do you know about zic? It takes files humans can read and makes a timezone file from it. Compiled timezone files for every timezone already exist, and you can download them.

So, what are you required to do that is beyond sitting down and writing a rules file and compiling it or downloading what you need already compiled?

If you do not need to programmatically change the timezone, but rather compile a new zoneinfo file, the following should help you: Linux Online - What are Time Zones?

change the TZ variable according to your need.
it will be defaulted to GMT ..
if you want have malaysia time i.e GMT+8.00 hrs..

so change the variable to TZ= Mal + 8..

let us know what do you want to do exactly like to change the time during running the application or shell script or...