If given an argument that does not start with @samp{+}, @command{date} sets
the system clock to the date and time specified by that argument (as
described below). You must have appropriate privileges to set the
-system clock. The @option{--date} and @option{--set} options may not be
-used with such an argument. The @option{--universal} option may be used
-with such an argument to indicate that the specified date and time are
-relative to Coordinated Universal Time rather than to the local time
-zone.
+system clock. Note for changes to persist across a reboot, the
+hardware clock may need to be updated from the system clock, which
+might not happen automatically on your system.
The argument must consist entirely of digits, which have the following
meaning:
second (optional)
@end table
-The @option{--set} option also sets the system clock; see the next section.
+Note, the @option{--date} and @option{--set} options may not be used with an
+argument in the above format. The @option{--universal} option may be used
+with such an argument to indicate that the specified date and time are
+relative to Coordinated Universal Time rather than to the local time zone.
@node Options for date
@opindex -s
@opindex --set
Set the date and time to @var{datestr}. See @option{-d} above.
+See also @ref{Setting the time}.
@item -u
@itemx --utc