How to convert date to timestamp in php

PHP Convert 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(): Parse the date and time description of any English text into a timestamp. mktime(): Get timestamp from date.

strtotime()

The function is used to convert the date represented by the English text string into a timestamp. It is the inverse function of date() and returns the 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:

<?phpecho 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:

codeint 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, not -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

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