than 100, we treat the years 00-68 as 2000-2068 and the years 69-99
as 1969-1999.  Not all platforms can represent the years 38-70, so
an error may result if these years are used.
.TP
\fIISO 8601 point-in-time\fR
.
An ISO 8601 point-in-time specification, such as
.QW "\fICCyymmdd\fBT\fIhhmmss\fR",
.QW "\fICCyymmdd\fBT\fIhhmmss\fR" ,
where \fBT\fR is the literal
.QW T ,
.QW "\fICCyymmdd hhmmss\fR" ,
.QW "\fICCyymmdd\fBT\fIhh:mm:ss\fR" ,
or
.QW "\fICCyy-mm-dd\fBT\fIhh\fB:\fImm\fB:\fIss\fR".
.QW "\fICCyy-mm-dd\fBT\fIhh\fB:\fImm\fB:\fIss\fR" .
Note that only these four formats are accepted.
The command does \fInot\fR accept the full range of point-in-time
specifications specified in ISO8601.  Other formats can be recognized by
giving an explicit \fB\-format\fR option to the \fBclock scan\fR command.
.TP
\fIrelative time\fR
.