How to convert php date format to timestamp

How to convert date format 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; 3. Use the strtotime function to convert Convert a date represented by an English text string to a timestamp.

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PHP date format to timestamp

PHP provides functions that can easily convert various forms of dates into timestamps. These functions are mainly:

strtotime(): parse the date and time description of any English text into time stamp.

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:

1 <?php
2 echo strtotime("2009-10-21 16:00:10"); //输出 1256112010
3 echo strtotime("10 September 2008"); //输出 1220976000
4 echo strtotime("+1 day"), "<br />"; //输出明天此时的时间戳
5 ?>

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:

1 <?php
2 echo mktime(21, 50, 55, 07, 14, 2010); //输出“1279115455”
3 ?>

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:

1 <?php
2 echo date("Y-m-d", mktime(0, 0, 0, 12, 32, 2007));
3 echo date("Y-m-d", mktime(0, 0, 0, 13, 1, 2007));
4 ?>

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

1 <?php
2 $lastday = mktime(0, 0, 0, 3, 0, 2008);
3 echo strftime("2008年最后一天是：%d", $lastday);
4 // 2008年最后一天是：29
5 ?>

Custom Function

Below The function is similar to strtotime.

01 <?php
02 $date_str = "2011-09-11 17:00:00";
03 echo $time_str = str_format_time($date_str);
04
05 function str_format_time($timestamp = &#39;&#39;)
06 {
07 if (preg_match("/[0-9]{4}-[0-9]{1,2}-[0-9]{1,2} (0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])/i", $timestamp))
08 {
09 list($date,$time)=explode(" ",$timestamp);
10 list($year,$month,$day)=explode("-",$date);
11 list($hour,$minute,$seconds )=explode(":",$time);
12 $timestamp=gmmktime($hour,$minute,$seconds,$month,$day,$year);
13 }
14 else
15 {
16 $timestamp=time();
17 }
18 return $timestamp;
19 }
20
21 echo &#39;<br />&#39;;
22 echo date("Y-m-d H:i:s", $time_str);
23
24 ?>

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