рассчитать разницу во времени (calculate time difference)
Имя (Name)
difftime - calculate time difference
Синопсис (Synopsis)
#include <time.h>
double difftime(time_t time1, time_t time0);
Описание (Description)
The difftime() function returns the number of seconds elapsed
between time time1 and time time0, represented as a double. Each
of the times is specified in calendar time, which means its value
is a measurement (in seconds) relative to the Epoch, 1970-01-01
00:00:00 +0000 (UTC).
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│difftime() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
Примечание (Note)
On a POSIX system, time_t is an arithmetic type, and one could
just define
#define difftime(t1,t0) (double)(t1 - t0)
when the possible overflow in the subtraction is not a concern.
Смотри также (See also)
date(1), gettimeofday(2), time(2), ctime(3), gmtime(3),
localtime(3)
