Calculating working hours time difference in PHP - php

Question

I wanted to calculate the number of hours between the encoded date and completion date. As of now I can compute the time difference between the two datetimes excluding the Saturdays and Sundays. My problem is I need to exclude the lunch breaks (12:00 am to 1:00 pm) and holidays.
Here is my code:
<?php
function business_hours($start, $end){
$startDate = new DateTime($start);
$endDate = new DateTime($end);
$periodInterval = new DateInterval( "PT1H" );
$period = new DatePeriod( $startDate, $periodInterval, $endDate );
$count = 0;
$holidays = [
"Human Rights Day" => new DateTime(date('Y') . '-03-21'),
"Good Friday" => new DateTime(date('Y') . '-03-30'),
"Family Day" => new DateTime(date('Y') . '-04-02'),
"Freedom Day" => new DateTime(date('Y') . '-04-27'),
"Labour Day" => new DateTime(date('Y') . '-05-01'),
"Youth Day" => new DateTime(date('Y') . '-06-16'),
"National Women's Day" => new DateTime(date('Y') . '-08-09'),
"Heritage Day" => new DateTime(date('Y') . '-09-24'),
"Day of Reconciliation" => new DateTime(date('Y') . '-12-16'),
];
foreach($period as $date){
$startofday = clone $date;
$startofday->setTime(8,00);
$endofday = clone $date;
$endofday->setTime(17,00);
if($date > $startofday && $date <= $endofday && !in_array($date->format('l'), array('Sunday','Saturday'))){
$count++;
}
}
echo $count;
}
$start = '2020-02-14 08:00:00';
$end = '2020-02-17 08:00:00';
$go = business_hours($start,$end);
//output 9 hours
?>
As per my code, I set the working hours from 8:00 to 17:00 and then excluded the Saturdays and Sundays. As per my example the output will be 9 (including the lunch break). How can I exclude the lunch break and holidays?
Update
The completion time can be more than 1 day. For example, the start date/time is 2020-02-14 08:00:00 and the completion time is 2020-02-19 08:00:00 the output is 27 hours. The calculation should exclude the lunch breaks of each day that have 12:00am to 1:00pm and holidays in between.
Update
I added an array of holidays, how can I exclude these holidays?

Answer 1

Since you're using a static/defined lunch break, you can use the following logic:
If $startDate is a weekday, and before 12:00, that's the start date for lunch calculation; otherwise it's the next weekday.
If the $endDate is a weekday, and after 13:00, that's the end date for lunch calculation; otherwise, it's the previous weekday
Actual number of lunch breaks equals the difference between those recalculated dates, at one hour each.
The following is pseudocode:
if(!in_array($startDate->format('l'), array('Sunday','Saturday')) && ($startDate->format('g') < 12) {
$startForLunch = $startDate;
}
else {
$startForLunch = new DateTime($start, '+1 day');
while(in_array($startDate->format('l'), array('Sunday','Saturday'))){
$startForLunch->add('1 day');
}
}
if(!in_array($endDate->format('l'), array('Sunday','Saturday')) && ($endDate->format('g') > 13) {
$endForLunch = $end;
}
else {
$endForLunch = new DateTime($endDate, '-1 day');
while(in_array($endDate->format('l'), array('Sunday','Saturday'))){
$endForLunch->add('-1 day');
}
}
$lunchPeriods = $endForLunch - $startForLunch + 1;

Answer 2

how about try add some condition inside loop each day to skip some hours
($date->format('H') <= 12 || $date->format('H') > 13)
it will skip if hour above 12 to 13 (if you use 24 format hour)
if($date > $startofday && $date <= $endofday && !in_array($date->format('l'), array('Sunday','Saturday')) && ($date->format('H') <= 12 || $date->format('H') > 13)){
$count++;
}
UPDATE
okay if your "holydays" is cutom maybe be good to add some paramerter to your function to store list of your holydays
function business_hours($start, $end,$holyDays = null){
//another line
}
and check every loop of dates is in on holydays list or not
in_array($date->format('Y-m-d'), $holyDays)
you will get filter of break time and custom holyday
function business_hours($start, $end,$holyDays = null){
$startDate = new DateTime($start);
$endDate = new DateTime($end);
$periodInterval = new DateInterval( "PT1H" );
$period = new DatePeriod( $startDate, $periodInterval, $endDate );
$count = 0;
foreach($period as $date){
$startofday = clone $date;
$startofday->setTime(8,00);
$endofday = clone $date;
$endofday->setTime(17,00);
//just some var to use in conditional check
$notHolyday = true;
//now check the array of holyday and check if in range dates is same with holydays we have
if($holyDays != null && is_array($holyDays) && in_array($date->format('Y-m-d'), $holyDays)){
$notHolyday = false;
}
if($date > $startofday && $date <= $endofday && !in_array($date->format('l'), array('Sunday','Saturday')) && ($date->format('H') <= 12 || $date->format('H') > 13) && $notHolyday){
$count++;
}
}
echo $count;
}
$start = '2020-02-14 08:00:00';
$end = '2020-02-19 08:00:00';
$holyDays = array('2020-02-17','2020-02-18');
$count = business_hours($start,$end,$holyDays);
echo $count;
i hope this is want you want