php - 计算两个日期之间的天数

Question

我有一个 mySQL 数据库。

我需要计算两个日期之间的天数。

我的客户将通过 php 表单填写 1979 年 1 月 1 日的输入hm_date以创建新记录。

我需要一个字段total_days来计算从hm_date今天到现在的总天数。我需要这个字段每天都在更新自己。

如何使hm_date总天数显示并始终更新？

我想这可以在服务器端实现吗？

我应该使用strototime()吗？

Answer 1

你会想要使用 MySQL 的DATEDIFF()

DATEDIFF() 返回 expr1 – expr2，表示为从一个日期到另一个日期的天数。expr1 和 expr2 是日期或日期和时间表达式。计算中仅使用值的日期部分。

mysql> SELECT DATEDIFF('2007-12-31 23:59:59','2007-12-30');
        -> 1
mysql> SELECT DATEDIFF('2010-11-30 23:59:59','2010-12-31');
        -> -31

根据您的问题，我认为您会想要DATE_DIFF(hm_date, CURRENT_DATE). 只要确保hm_date是YYYY-MM-DD格式。

Answer 2

使用 PHP：

$daydiff = floor( ( strtotime( $endDate ) - strtotime( $startDate ) ) / 86400 );

$startDate 和 $endDate 可以是此处解释的任何有效日期格式： http ://www.php.net/manual/en/datetime.formats.date.php

Answer 3

它很容易但很长..请遵循以下代码

<?php

  // Set timezone
  date_default_timezone_set("UTC");

  // Time format is UNIX timestamp or
  // PHP strtotime compatible strings
  function dateDiff($time1, $time2, $precision = 6) {
    // If not numeric then convert texts to unix timestamps
    if (!is_int($time1)) {
      $time1 = strtotime($time1);
    }
    if (!is_int($time2)) {
      $time2 = strtotime($time2);
    }

    // If time1 is bigger than time2
    // Then swap time1 and time2
    if ($time1 > $time2) {
      $ttime = $time1;
      $time1 = $time2;
      $time2 = $ttime;
    }

    // Set up intervals and diffs arrays
    $intervals = array('year','month','day','hour','minute','second');
    $diffs = array();

    // Loop thru all intervals
    foreach ($intervals as $interval) {
      // Set default diff to 0
      $diffs[$interval] = 0;
      // Create temp time from time1 and interval
      $ttime = strtotime("+1 " . $interval, $time1);
      // Loop until temp time is smaller than time2
      while ($time2 >= $ttime) {
    $time1 = $ttime;
    $diffs[$interval]++;
    // Create new temp time from time1 and interval
    $ttime = strtotime("+1 " . $interval, $time1);
      }
    }

    $count = 0;
    $times = array();
    // Loop thru all diffs
    foreach ($diffs as $interval => $value) {
      // Break if we have needed precission
      if ($count >= $precision) {
    break;
      }
      // Add value and interval 
      // if value is bigger than 0
      if ($value > 0) {
    // Add s if value is not 1
    if ($value != 1) {
      $interval .= "s";
    }
    // Add value and interval to times array
    $times[] = $value . " " . $interval;
    $count++;
      }
    }

    // Return string with times
    return implode(", ", $times);
  }

?>

现在试试这个，看看它如何显示差异......

echo dateDiff("2010-01-26", "2004-01-26") . "\n";
echo dateDiff("2006-04-12 12:30:00", "1987-04-12 12:30:01") . "\n";
echo dateDiff("now", "now +2 months") . "\n";
echo dateDiff("now", "now -6 year -2 months -10 days") . "\n";
echo dateDiff("2009-01-26", "2004-01-26 15:38:11") . "\n";