62 lines
1.2 KiB
Groff
62 lines
1.2 KiB
Groff
.TH caltime 3
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.SH NAME
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caltime_tai \- convert calendar dates and times
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.SH SYNTAX
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.B #include <caltime.h>
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.br
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.B #include <tai.h>
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void \fBcaltime_tai\fP(&\fIct\fR,&\fIt\fR);
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.br
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void \fBcaltime_utc\fP(&\fIct\fR,&\fIt\fR,&\fIweekday\fR,&\fIyearday\fR);
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struct caltime \fIct\fR;
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.br
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struct tai \fIt\fR;
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.br
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int *\fIweekday\fR;
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.br
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int *\fIyearday\fR;
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.SH DESCRIPTION
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.B caltime_tai
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reads a date, time, and UTC offset from
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.IR ct .
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It puts the corresponding TAI64 label into
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.IR t .
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.B caltime_utc
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reads a TAI64 label from
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.IR t .
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It puts the corresponding date and time into
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.IR ct ,
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with UTC offset 0.
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.B caltime_utc
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fills in
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.I weekday
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and
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.I yearday
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the same way as
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.BR caldate_frommjd .
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.SH LIMITATIONS
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The sequence of TAI64 labels has been determined
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for the next few hundred billion years.
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The same is not true, however, for
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calendar dates and times.
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New leap seconds are added every year or two,
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as discussed in
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.BR leapsecs (3);
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and the Gregorian calendar will change in a few thousand years,
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as discussed in
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.BR caldate_mjd (3).
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This means that
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.B caltime_tai
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and
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.B caltime_utc
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are not useful for dates far in the future.
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.SH "SEE ALSO"
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caldate_mjd(3),
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caltime(3),
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tai(3),
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leapsecs(3)
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