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daylight (3)
  • daylight (3) ( Linux man: Библиотечные вызовы )
  • >> daylight (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    daylight, timezone, tzname, tzset - set timezone conversion information
     
    

    SYNOPSIS

    #include <time.h>

    extern int daylight;
    extern long timezone;

    extern char *tzname[2];
    void tzset(void);

     

    DESCRIPTION

    The tzset() function shall use the value of the environment variable TZ to set time conversion information used by ctime() , localtime() , mktime() , and strftime() . If TZ is absent from the environment, implementation-defined default timezone information shall be used.

    The tzset() function shall set the external variable tzname as follows:

    
    tzname[0] = "std";
    tzname[1] = "dst";
    
    

    where std and dst are as described in the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 8, Environment Variables.

    The tzset() function also shall set the external variable daylight to 0 if Daylight Savings Time conversions should never be applied for the timezone in use; otherwise, non-zero. The external variable timezone shall be set to the difference, in seconds, between Coordinated Universal Time (UTC) and local standard time.  

    RETURN VALUE

    The tzset() function shall not return a value.  

    ERRORS

    No errors are defined.

    The following sections are informative.  

    EXAMPLES

    Example TZ variables and their timezone differences are given in the table below:
    TZ timezone     
    EST5EDT 5*60*60     
    GMT0 0*60*60     
    JST-9 -9*60*60     
    MET-1MEST -1*60*60     
    MST7MDT 7*60*60     
    PST8PDT 8*60*60     
     

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    ctime() , localtime() , mktime() , strftime() , the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 8, Environment Variables, <time.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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