difftime3p

Compute the difference between two calendar time values

Usage

#include <time.h>

double difftime(time_t time1, time_t time0);

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.

Overview

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.

Return value

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

Errors

No errors are defined.

The following sections are informative.

Examples

None.

Application usage

None.

Rationale

None.

Future directions

None.