1DIFFTIME(3P)               POSIX Programmer's Manual              DIFFTIME(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       difftime — compute the difference between two calendar time values
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SYNOPSIS

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

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
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26       The difftime() function shall compute the difference between two calen‐
27       dar times (as returned by time()): time1− time0.
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RETURN VALUE

30       The difftime() function shall return the difference expressed  in  sec‐
31       onds as a type double.
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ERRORS

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       None.
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RATIONALE

45       None.
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FUTURE DIRECTIONS

48       None.
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SEE ALSO

51       asctime(),  clock(),  ctime(),  gmtime(),  localtime(), mktime(), strf‐
52       time(), strptime(), time(), utime()
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54       The Base Definitions volume of POSIX.1‐2008, <time.h>
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57       Portions of this text are reprinted and reproduced in  electronic  form
58       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
59       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
60       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
61       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
62       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.unix.org/online.html .
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68       Any  typographical  or  formatting  errors that appear in this page are
69       most likely to have been introduced during the conversion of the source
70       files  to  man page format. To report such errors, see https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
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75IEEE/The Open Group                  2013                         DIFFTIME(3P)
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