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

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

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

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The difftime() function shall compute the difference between two calen‐
26       dar times (as returned by time()): time1- time0.
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RETURN VALUE

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

33       No errors are defined.
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35       The following sections are informative.
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EXAMPLES

38       None.
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APPLICATION USAGE

41       None.
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RATIONALE

44       None.
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FUTURE DIRECTIONS

47       None.
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SEE ALSO

50       asctime(),  clock(),  ctime(),  gmtime(),  localtime(), mktime(), strf‐
51       time(), strptime(), time(), utime()
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53       The Base Definitions volume of POSIX.1‐2017, <time.h>
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56       Portions of this text are reprinted and reproduced in  electronic  form
57       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
58       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
59       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
60       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
61       event of any discrepancy between this version and the original IEEE and
62       The Open Group Standard, the original IEEE and The Open Group  Standard
63       is  the  referee document. The original Standard can be obtained online
64       at http://www.opengroup.org/unix/online.html .
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66       Any typographical or formatting errors that appear  in  this  page  are
67       most likely to have been introduced during the conversion of the source
68       files to man page format. To report such errors,  see  https://www.ker‐
69       nel.org/doc/man-pages/reporting_bugs.html .
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73IEEE/The Open Group                  2017                         DIFFTIME(3P)
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