difftime (original) (raw)

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()): _time_1- _time_0.

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.

End of informative text.

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