How do I change the system time using C on Linux?

[cesar7160]

I need to do a C program where user will be able to change the system time.

I'm looking for this at some websites, but I can't find how to solve this.

How do I change the system time using C on Linux?

Any clue?

10x

[Salem]

Are you running as root?

[cesar7160]

Yes, I am.

[cesar7160]

This is what I have:

time_t tiempovar;
        struct tm * tmdvar;
        time ( &tiempovar );
        tmdvar = localtime ( &tiempovar );
        tmdvar->tm_year = 2009 - 1900;
        tmdvar->tm_mon = 5;
        tmdvar->tm_mday = 26;

        //struct tz * tzvar;
        //settimeofday(*tmdvar, const struct timezone *tz);

[Salem]

http://www.manpagez.com/man/2/settimeofday/
The timezone is NULL, and you fill in a struct timeval and pass a pointer to it.

[cesar7160]

http://www.manpagez.com/man/2/settimeofday/ The timezone is NULL, and you fill in a struct timeval and pass a pointer to it.

How do I use "struct timezone" correctly?

Can you please include some code?

Thanks

[Salem]

Read the manual - it's not used, so passing NULL should work just fine.

[cesar7160]

Read the manual - it's not used, so passing NULL should work just fine.

I solved it.

I'll copy the code tomorrow.