The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2003 Edition
Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.
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]](../images/opt-start.gif)
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]](../images/opt-end.gif)
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.
End of informative text.
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