# How to calculate the difference between two dates in PHP?

Given two dates, start_date and end_date. The task is to find the difference between two dates.

Examples:

Input: start_date: 2016-06-01 22:45:00 end_date: 2018-09-21 10:44:01 Output: 2 years, 3 months, 21 days, 11 hours, 59 minutes, 1 seconds Input: start_date: 2015-05-12 12:37:30 end_date: 2018-04-25 12:45:31 Output: 2 years, 11 months, 19 days, 0 hours, 8 minutes, 1 seconds

**Method 1:** Use date_diff() Function to find the difference between two dates.

**Method 2:** To use date-time mathematical formula to find the difference between two dates. It returns the years, months, days, hours, minutes, seconds between two specified dates.

**Program:**

`<?php` ` ` `// Declare and define two dates` `$date1` `= ` `strtotime` `(` `"2016-06-01 22:45:00"` `); ` `$date2` `= ` `strtotime` `(` `"2018-09-21 10:44:01"` `); ` ` ` `// Formulate the Difference between two dates` `$diff` `= ` `abs` `(` `$date2` `- ` `$date1` `); ` ` ` ` ` `// To get the year divide the resultant date into` `// total seconds in a year (365*60*60*24)` `$years` `= ` `floor` `(` `$diff` `/ (365*60*60*24)); ` ` ` ` ` `// To get the month, subtract it with years and` `// divide the resultant date into` `// total seconds in a month (30*60*60*24)` `$months` `= ` `floor` `((` `$diff` `- ` `$years` `* 365*60*60*24)` ` ` `/ (30*60*60*24)); ` ` ` ` ` `// To get the day, subtract it with years and ` `// months and divide the resultant date into` `// total seconds in a days (60*60*24)` `$days` `= ` `floor` `((` `$diff` `- ` `$years` `* 365*60*60*24 - ` ` ` `$months` `*30*60*60*24)/ (60*60*24));` ` ` ` ` `// To get the hour, subtract it with years, ` `// months & seconds and divide the resultant` `// date into total seconds in a hours (60*60)` `$hours` `= ` `floor` `((` `$diff` `- ` `$years` `* 365*60*60*24 ` ` ` `- ` `$months` `*30*60*60*24 - ` `$days` `*60*60*24)` ` ` `/ (60*60)); ` ` ` ` ` `// To get the minutes, subtract it with years,` `// months, seconds and hours and divide the ` `// resultant date into total seconds i.e. 60` `$minutes` `= ` `floor` `((` `$diff` `- ` `$years` `* 365*60*60*24 ` ` ` `- ` `$months` `*30*60*60*24 - ` `$days` `*60*60*24 ` ` ` `- ` `$hours` `*60*60)/ 60); ` ` ` ` ` `// To get the minutes, subtract it with years,` `// months, seconds, hours and minutes ` `$seconds` `= ` `floor` `((` `$diff` `- ` `$years` `* 365*60*60*24 ` ` ` `- ` `$months` `*30*60*60*24 - ` `$days` `*60*60*24` ` ` `- ` `$hours` `*60*60 - ` `$minutes` `*60)); ` ` ` `// Print the result` `printf(` `"%d years, %d months, %d days, %d hours, "` ` ` `. ` `"%d minutes, %d seconds"` `, ` `$years` `, ` `$months` `,` ` ` `$days` `, ` `$hours` `, ` `$minutes` `, ` `$seconds` `); ` `?>` |

**Output:**

2 years, 3 months, 21 days, 11 hours, 59 minutes, 1 seconds

**Method 3:** This method is used to get the total number of days between two specified dates.

`<?php` ` ` `// Declare two dates` `$start_date` `= ` `strtotime` `(` `"2018-06-08"` `);` `$end_date` `= ` `strtotime` `(` `"2018-09-19"` `);` ` ` `// Get the difference and divide into ` `// total no. seconds 60/60/24 to get ` `// number of days` `echo` `"Difference between two dates: "` ` ` `. (` `$end_date` `- ` `$start_date` `)/60/60/24;` `?>` |

**Output:**

Difference between two dates: 103

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