Adding and Subtracting Dates (Calculating Time Difference)

Suppose, we want to find how much time is left in Christmas. The current date and time is “20^th December 2012, 1:03:47 PM” and Christmas starts at “24 December 2012, 11:59:59 PM”.

Format of your dates should be as “YYYY-MM-DD hh:mm:ss” with 24 hour format.

So,

                Present Time:    2012-12-20 13:03:47

                Future Time:      2012-12-24 23:59:59

Following PHP code gives you the Day, Hours, Minutes and Seconds left.

<?php

     //This is the future time in standart format.

     $fut_time="2012-12-25 23:59:59";    

     //strtotime() function converts the future time into seconds format.

     $fut_time_insecs=strtotime($fut_time);

//The time() function gives the current time in seconds format.

     $pre_time_insecs=time();  

    

//variable left_time_insecs contains the time difference in seconds.

     $left_time_insecs=$fut_time_insecs-$pre_time_insecs;

     //This gives the seconds.

     $seconds=$left_time_insecs%60;

     //Total minutes left

     $left_time_inmins=floor($left_time_insecs/60);

    

     //This gives the minutes.

     $minutes=$left_time_inmins%60; 

     //Total hours left

     $left_time_inhrs=floor($left_time_inmins/60);

    

     //This gives the seconds.

     $hours=$left_time_inhrs%60;    

     //Total minutes left

     $left_time_indays=floor($left_time_inhrs/60);

    

     //Total days left

     $days=$left_time_indays;

    

     //Displays Days, Hours, Minutes and Seconds left
     echo "Christmas: ".$days." Days ".$hours." Hours ".$minutes." Minutes ".$seconds." Seconds Left";

?>

OUTPUT:

Christmas: 2 Days 10 Hours 56 Minutes 12 Seconds Left

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