difftime

Defined in header `<time.h>`
double difftime( time_t time_end, time_t time_beg );

Computes difference between two calendar times as time_t objects (time_end - time_beg) in seconds. If time_end refers to time point before time_beg then the result is negative.

Parameters

time_beg, time_end

-

times to compare

Return value

Difference between two times in seconds.

Notes

On POSIX systems, time_t is measured in seconds, and difftime is equivalent to arithmetic subtraction, but C and C++ allow fractional units for time_t.

Language
headers
Type support
Dynamic memory management
Error handling
Program utilities
Variadic function support
Date and time utilities
Strings library
Algorithms
Numerics
Input/output support
Localization support
Thread support (C11)
Atomic operations (C11)
Technical Specifications

Functions
Time manipulation
difftime
time
clock
timespec_get (C11)
Format conversions
asctimeasctime_s (C11)
ctimectime_s (C11)
strftime
wcsftime (C95)
gmtimegmtime_s (C11)
localtimelocaltime_s (C11)
mktime
Constants
CLOCKS_PER_SEC
Types
tm
time_t
clock_t
timespec (C11)