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# 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.

## Demo

Number of Days Since 29th October 2017 is 543

Years 1.49

Original Total Cost: \$331, Cost per Day \$0.61

database file: /home/kruxor/Dropbox/ssl.kruxor.com/root/kruxor.com/db/db.db
comments_dbfile: /home/kruxor/Dropbox/ssl.kruxor.com/root/kruxor.com/db/comments.db (\$db_comments)
views_dbfile: /home/kruxor/Dropbox/ssl.kruxor.com/root/kruxor.com/db/views.db
\$dbfood_file: /home/kruxor/Dropbox/ssl.kruxor.com/root/kruxor.com/db/food.db
db_linx: /home/kruxor/Dropbox/ssl.kruxor.com/root/kruxor.com/linx/db/db.db
Classes Loaded:
class/answers.class.php
class/code.class.php
class/comments.class.php
class/content.class.php
class/core.class.php
class/crud.class.php
class/crumbs.class.php
class/featured.class.php
class/food.class.php
class/functions.class.php
class/images.class.php
class/import.class.php
class/links.class.php
class/questions.class.php
class/template.class.php
class/tv.class.php
class/user.class.php
class/utilities.class.php
class/views.class.php
class/widget.class.php
Class Extend Loaded: class/extends/expenses.extend.php
Class Extend Loaded: class/extends/gary_cummins_timeline.extend.php
Class Extend Loaded: class/extends/moo.extend.php
Class Extend Loaded: class/extends/osrs_item_data.extend.php
Class Extend Loaded: class/extends/osrs_slayer.extend.php
Class Extend Loaded: class/extends/osrs_slayer_monsters.extend.php
Class Extend Loaded: class/extends/searches.extend.php
Core Database Connected: expenses.db
expenses add_to_menu:
Class Extend Auto Initialized as: expenses
Core Database Connected: gary_cummins_timeline.db
gary_cummins_timeline add_to_menu:
Class Extend Auto Initialized as: gary_cummins_timeline
Core Database Connected: moo.db
moo add_to_menu:
Class Extend Auto Initialized as: moo
Core Database Connected: osrs_item_data.db
osrs_item_data add_to_menu:
Class Extend Auto Initialized as: osrs_item_data
Core Database Connected: osrs_slayer.db
osrs_slayer add_to_menu:
Class Extend Auto Initialized as: osrs_slayer
Core Database Connected: osrs_slayer_monsters.db
osrs_slayer_monsters add_to_menu:
Class Extend Auto Initialized as: osrs_slayer_monsters
Core Database Connected: searches.db
searches add_to_menu:
Class Extend Auto Initialized as: searches
\$user_logged_in:
user access level:
pages:
\$p1:view
\$p2:code
\$p3:emGp9
\$p4:how-many-days-since-a-date-and-other-calculations
\$p5:
\$p6:
\$p:/view/code/emGp9/how-many-days-since-a-date-and-other-calculations/
Using Template: view-code.html