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Most of ticketing alert projects needed SLA calculation to exclude holidays and weekends or Off business hours. First of all, let us take a look at types of SLA we need to calculate. For instance, few companies will work 24/7 shifts and 8x5, 8x7 etc. So we need to consider business hours. In this example, I'm considering business hours which starts at 09:00 AM and ends at 06:00 PM. Also, using this code we can calculate 24/7 too. Let's consider business hours started at 9:00 AM to 18:00 PM without weekends. Now, take the actual work start period and end period.                                                       Demo <?php $incident_work_started = '2018-09-12 09:28:07'; $incident_work_ended = '2018-09-19 17:45:00'; $totalHours = round(get_working_hours($incident_work_started,$incident_work_ended),2)."\n"; echo "Total hours: ".$totalHours; function get_working_hours($work_started,$work_ended) { //