The Open Group Base Specifications Issue 8
IEEE Std 1003.1-2024
Copyright © 2001-2024 The IEEE and The Open Group
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 POSIX.1-2024 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 , futimens , gmtime , localtime , mktime , strftime , strptime , time
XBD <time.h>
CHANGE HISTORY
First released in Issue 4. Derived from the ISO C standard.
End of informative text.
return to top of page
UNIX® is a registered Trademark of The Open Group.
POSIX™ is a Trademark of The IEEE.
Copyright © 2001-2024 The IEEE and The Open Group, All Rights Reserved
[ Main Index | XBD | XSH | XCU | XRAT
]