You can build macros and add them to your config.php. Here is a sample that I just tested for business hours and after hours. You then want to add this to your alert_rules. Remember that you will need to double up your rules. You will need to create rules for Business hours(BH) and After hours(AH). I created rules for AH that delay for 11m so if something just pops then I do not get and email. During BH I have it setup for delay of 6m on alert rules.
Business hours(BH) Mon-Fri (7 am - 5:59 pm)
After hours(AH) Mon-Fri (6 pm - 6:59 am), Sat/Sun(all day)
$config[‘alert’][‘macros’][‘rule’][‘business_hours’] = ‘(HOUR(now()) >= 7 AND HOUR(now()) <= 17) AND WEEKDAY(now()) <= 4’;
$config[‘alert’][‘macros’][‘rule’][‘after_hours’] = ‘(HOUR(now()) <= 6 OR HOUR(now()) >= 18) OR WEEKDAY(now()) >= 5’;
