.TP
\fB\-validate\fR boolean
.
If \fIboolean\fR is true (default), \fBclock scan\fR will raise an error
if the input contains invalid values, e.g. day of month greater than
number of days in the month. If specified as false, the command makes
an adjustment to bring values within acceptable range. See
\fBSCANNING TIMES\fT for details.
\fBSCANNING TIMES\fR for details.
.PP
If none of these is present, the C \fBlocaltime\fR and \fBmktime\fR
functions are used to attempt to convert times between local and
Greenwich.  On 32-bit systems, this approach is likely to have bugs,
particularly for times that lie outside the window (approximately the
years 1902 to 2037) that can be represented in a 32-bit integer.
.SH "CLOCK ARITHMETIC"