3Com 3C13618 Command Reference Manual page 691

Security
display timerange command. When this function is enabled, the system will
determine if the access rules within the timerange (special) or outside the timerange
(normal) are to be used, according to the current time and the set time range. The
precision at which the system queries the time is 1 minute. And the two ends of the
set time range belong to the time range.
For related commands, see settr, display timerange.
Example
# Enable the timerange packet filter function.
[3Com]timerange enable
41