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   difftime.3p    ( 3 )

вычислить разницу между двумя значениями календарного времени (compute the difference between two calendar time values)

Пролог (Prolog)

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

Имя (Name)

difftime — compute the difference between two calendar time
       values

Синопсис (Synopsis)

#include <time.h>


       double difftime(time_t time1, time_t time0);

Описание (Description)

The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.


       The difftime() function shall compute the difference between two
       calendar times (as returned by time()): time1- time0.

Возвращаемое значение (Return value)

The difftime() function shall return the difference expressed in
       seconds as a type double.

Ошибки (Error)

No errors are defined.


       The following sections are informative.

Примеры (Examples)

None.

Использование в приложениях (Application usage)

None.

Обоснование (Rationale)

None.

Будущие направления (Future directions)

None.

Смотри также (See also)

asctime(3p), clock(3p), ctime(3p), gmtime(3p), localtime(3p),
       mktime(3p), strftime(3p), strptime(3p), time(3p), utime(3p)


       The Base Definitions volume of POSIX.1‐2017, time.h(0p)