The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.
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NAME

difftime - compute the difference between two calendar time values

SYNOPSIS

#include <time.h>

double difftime(time_t time1, time_t time0);

DESCRIPTION

[CX] [Option Start] 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 IEEE Std 1003.1-2001 defers to the ISO C standard. [Option End]

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.

SEE ALSO

asctime(), clock(), ctime() , gmtime(), localtime(), mktime(), strftime(), strptime(), time(), utime(), the Base Definitions volume of IEEE Std 1003.1-2001, <time.h>

CHANGE HISTORY

First released in Issue 4. Derived from the ISO C standard.

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