php - 时间函数应用

1 指定日期加天数

<?php

//PHP Example code to add one day,one month or one year to todays date

$todayDate = date("Y-m-d");// current date
echo "Today: ".$todayDate."";

//Add one day to today
$dateOneDayAdded = strtotime(date("Y-m-d", strtotime($todayDate)) . "+1 day");

echo "After adding one Day: ".date('l dS \o\f F Y', $dateOneDayAdded)."";

//Add one month to today
$dateOneMonthAdded = strtotime(date("Y-m-d", strtotime($todayDate)) . "+1 month");

echo "After adding one month: ".date('l dS \o\f F Y', $dateOneMonthAdded)."";

//Add one Year to today
$dateOneYearAdded = strtotime(date("Y-m-d", strtotime($todayDate)) . "+1 year");

echo "After adding one Year: ".date('l dS \o\f F Y', $dateOneYearAdded)."";
?>

2 计算两天的时间间隔

<?php

$date1 = "2007-03-24";
$date2 = "2009-06-26";

$diff = abs(strtotime($date2) - strtotime($date1));

$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));

printf("%d years, %d months, %d days\n", $years, $months, $days);
?>

3 计算两天之间的天数

<?php
function GetDays($sStartDate, $sEndDate){
  // Firstly, format the provided dates.
  // This function works best with YYYY-MM-DD
  // but other date formats will work thanks
  // to strtotime().
  $sStartDate = gmdate("Y-m-d", strtotime($sStartDate));
  $sEndDate = gmdate("Y-m-d", strtotime($sEndDate));

  // Start the variable off with the start date
  $aDays[] = $sStartDate;

  // Set a 'temp' variable, sCurrentDate, with
  // the start date - before beginning the loop
  $sCurrentDate = $sStartDate;

  // While the current date is less than the end date
  while($sCurrentDate < $sEndDate){
    // Add a day to the current date
    $sCurrentDate = gmdate("Y-m-d", strtotime("+1 day", strtotime($sCurrentDate)));

    // Add this new day to the aDays array
    $aDays[] = $sCurrentDate;
  }

  // Once the loop has finished, return the
  // array of days.
  return $aDays;
}

$aDays = GetDays('5th Feb 2007', '10th Feb 2007');
GetDays('2007-01-01', '2007-01-31');
GetDays('19-02-2007', '25-02-2007');
?>