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difftime (3)
  • difftime (3) ( Solaris man: Библиотечные вызовы )
  • difftime (3) ( FreeBSD man: Библиотечные вызовы )
  • difftime (3) ( Русские man: Библиотечные вызовы )
  • >> difftime (3) ( Linux man: Библиотечные вызовы )
  • difftime (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    difftime - calculate time difference
     
    

    SYNOPSIS

    #include <time.h>
    
    double difftime(time_t time1, time_t time0);
    
     

    DESCRIPTION

    The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. The two times are specified in calendar time, which represents the time elapsed since the Epoch (00:00:00 on January 1, 1970, Coordinated Universal Time (UTC)).  

    CONFORMING TO

    SVr4, 4.3BSD, C89, C99.  

    NOTES

    On a POSIX system, time_t is an arithmetic type, and one could just define
    
    #define difftime(t1,t0) (double)(t1 - t0)
    
    
    when the possible overflow in the subtraction is not a concern. On other systems, the data type time_t might use some other encoding where subtraction doesn't work directly.  

    SEE ALSO

    date(1), gettimeofday(2), time(2), ctime(3), gmtime(3), localtime(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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