How Many Days Since a Date and other Calculations
Here i calculate the number of days since a certain date in php and use the values for checking how much something costs per day.
Start Date
Lets add the date that the item was purchaced. In date format Year-Month-Day
$date_start = date_create("2017-10-29");
Today's Date
Get todays date according to the server date with php
$todays_date = date_create(date('Y-m-d'));
Check the difference between the dates
Using the date_diff function we can check the difference between these dates.
$diff = date_diff($date_start,$todays_date);
Output the details
I usually like to add all the data into a variable and then return it so here we will add all the data to the variable $template_result. This will give us the amount of days since the original date.
$template_result = 'Number of Days Since 29th October 2017 is '.$diff->format("%a");
More Calculations
Using this number we can calculate different things like how many years or months since a date.
Years Since Calculation
Calculate the Years since the date.
$years_calc = $diff->format("%a") / 365;
$years_calc = number_format($years_calc, 2);
$template_result .= "<p>Years $years_calc </p>";
Cost per Day
If the item has an original value we can then calculate the cost per day using the original number.
$cost = 331;
$per_day = $cost / $diff->format("%a");
$per_day = number_format($per_day, 2);
$template_result .= "<p>Original Total Cost: $$cost, Cost per Day $$per_day </p>";
Return the results
Now we can just return the results or just echo them.
echo $template_result;
You can see a working demo below.
Years 6.53
Original Total Cost: $331, Cost per Day $0.14
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
