SYNTAX

       #include <datetime.h>

       void datetime_tai(&dt,t);

       datetime_sec datetime_untai(&dt);

       struct datetime dt;
       datetime_sec t;

DESCRIPTION

       International Atomic Time, TAI, is the fundamental unit for time
       measurements.  TAI has one label for every second of real time, without
       complications such as leap seconds.

       A struct datetime variable, such as dt, stores a TAI label.  dt.year is
       the year number minus 1900; dt.mon is the month number, from 0
       (January) through 11 (December); dt.mday is the day of the month, from
       1 through 31; dt.hour is the hour, from 0 through 23; dt.min is the
       minute, from 0 through 59; dt.sec is the second, from 0 through 59;
       dt.wday is the day of the week, from 0 (Sunday) through 6 (Saturday);
       dt.yday is the day of the year, from 0 through 365.

       The datetime library supports more convenient TAI manipulation with the
       datetime_sec type.  A datetime_sec value, such as t, is an integer
       referring to the tth second after the beginning of 1970 TAI.  The first
       second of 1970 TAI was 0; the next second was 1; the last second of
       1969 TAI was -1.  The difference between two datetime_sec values is a
       number of real-time seconds.

       datetime_tai converts a datetime_sec to a TAI label.

       datetime_untai reads a TAI label (specifically dt.year, dt.mon,
       dt.mday, dt.hour, dt.min, and dt.sec) and returns a datetime_sec.

SEE ALSO

       now(3)



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