Here's a simple example of taking action in an iRule based on a time window. We use the clock scan and clock seconds commands to convert a timestamp in a user-friendly format to UTC (time since the Unix epoch of 0.0.1970) and check it against the current time.
when RULE_INIT {
# Start of maintenance window in YYYY-mm-dd HH:MM format
set static::start_date "2011-05-29 18:45"
# End of maintenance window in YYYY-mm-dd HH:MM format
set static::end_date "2011-05-29 18:50"
# Convert start/end times to seconds from the epoch for easier date comparisons
set static::start [clock scan $static::start_date]
set static::end [clock scan $static::end_date]
}
when CLIENT_ACCEPTED {
# Get the current time in seconds since the Unix epoch of 0-0-1970
set now [clock seconds]
# Check if the current time is between the start and end times
if {$now > $static::start and $now < $static::end}{
pool MAINT_POOL
}
# Default action is to use the virtual server default pool
}
