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.
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