How to convert date to timestamp in php

How to convert date to timestamp in php: 1. Use the strtotime function to parse the date and time description of any English text into a timestamp; 2. Use the mktime function to obtain the timestamp from the date.

Recommended: "PHP Video Tutorial"

PHP date to timestamp strtotime and mktime functions

Convert date to timestamp

PHP provides functions that can easily convert various forms of dates into timestamps. The main functions of this type are:

strtotime(): Convert any A datetime description of English text parsed into a timestamp.

mktime(): Get timestamp from date.

strtotime()

strtotime() function is used to convert the date represented by the English text string into a timestamp. It is the inverse function of date(). It returns a timestamp successfully, otherwise it returns FALSE. .

Syntax:

int strtotime ( string time [, int now] )

The parameter time is the parsed string, which is the date represented according to the GNU date input format.

Example:

<?php
echo strtotime("2009-10-21 16:00:10");
//输出 1256112010
echo strtotime("10 September 2008");
//输出 1220976000
echo strtotime("+1 day"), "<br />";
//输出明天此时的时间戳
?>

mktime()

mktime() function is used to get the timestamp from the date, and returns the timestamp successfully, otherwise it returns FALSE.

Syntax:

int mktime(时, 分, 秒, 月, 日, 年)

Example:

<?php
echo mktime(21, 50, 55, 07, 14, 2010);
//输出“1279115455”
?>

Parameters can be omitted from right to left, and any omitted parameters will be set to the current value of the local date and time.

mktime() is useful for doing date calculations and validation, it will automatically calculate the correct value for out-of-range input. For example, the following example outputs 2008-01-01:

<?php
echo date("Y-m-d", mktime(0, 0, 0, 12, 32, 2007));
echo date("Y-m-d", mktime(0, 0, 0, 13, 1, 2007));
?>

The last day of the next month:

The last day of any given month can be expressed as the first day of the next month "0" days instead of -1 days, as in the following example:

<?php
$lastday = mktime(0, 0, 0, 3, 0, 2008);
echo strftime("2008年最后一天是：%d", $lastday);
?>

Browser output:

2008年最后一天是：29

The above is the detailed content of How to convert date to timestamp in php. For more information, please follow other related articles on the PHP Chinese website!