PHP中如何计算两个日期之间的差异（） _如何计算两个日期之间的差异

给定两个日期, start_date和end_date。任务是找到两个日期之间的差异。
例子：

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

方法1：采用date_diff()函数找出两个日期之间的差异。
方法2：使用日期时间数学公式来查找两个日期之间的时差。它返回两个指定日期之间的年, 月, 日, 小时, 分钟, 秒。
程序：

< ?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 ); ?>

【PHP中如何计算两个日期之间的差异（）】输出如下：

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

方法3：此方法用于获取两个指定日期之间的总天数。

< ?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; ?>

输出如下：