How to convert string to date format in php

Method to convert to date format: 1. Use the "strtotime($string)" statement to convert the date and time text of the specified string type into a timestamp; 2. Use "date("Y-m-d H:i The :s",timestamp)" statement formats the timestamp and converts it into the date format of "year-month-day hour:minute:second".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php will convert string Implementation method for date format

:

• Use strtotime() to extract the time and date from the string, converting the English The date and time description of the text description is parsed into a UNIX timestamp

• date() formats the timestamp and converts it to a date in the specified format

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
ini_set(&#39;date.timezone&#39;, &#39;Asia/Shanghai&#39;);//设置时区 
echo date("Y-m-d H:i:s",strtotime("now")), "<br />";
echo date("Y-m-d H:i:s",strtotime("10 September 2000")), "<br />";
echo date("Y-m-d H:i:s",strtotime("+1 day")), "<br />";
echo date("Y-m-d H:i:s",strtotime("+1 week")), "<br />";
echo date("Y-m-d H:i:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "<br />";
echo date("Y-m-d H:i:s",strtotime("next Thursday")), "<br />";
echo date("Y-m-d H:i:s",strtotime("last Monday")), "<br />";
?>

Description:

date() first parameter formats special characters that can be recognized in the string As shown in the following table:

##D in English for the day of the week. Abbreviation (using 3 letters) Mon to Sunl (lowercase letter of "L") English word for day of the weekSunday to SaturdayNAccording to the ISO-8601 standard format, use numbers to represent the days of the week (newly added in PHP5.1.0) 1 (meaning Monday) to 7 (meaning Sunday) SThe English suffix after the day of the month (use 2 characters to represent )st, nd, rd or th. Can be used with jwUse numbers to represent the day of the week0 (for Sunday) to 6 (for Saturday) zUse numbers to represent the days of the year0 to 365 WAccording to the ISO-8601 standard format, use numbers to represent the week of the year, each week starts on Monday, (new in PHP 4.1.0) For example: 42 (current year The 42nd week) F English words for the month, such as January or JuneJanuary to DecembermUse two digits to represent the current month01 to 12##MntLoYya##AUppercase AM and PM valuesAM or PMBSwatch Internet Standard Time 000 to 999 gUse 12-hour format to represent hours1 to 12GUse 24-hour format to represent hours0 to 23hRepresent hours using 12-hour format, with leading zeros 01 to 12HRepresent hours using 24-hour format, with leading zeros 00 to 23iUse two digits to represent minutes, with leading zeros00 to 59>sUse two digits to represent seconds , with leading zeros 00 to 59>u milliseconds (new in PHP 5.2.2). It should be noted that the date() function always returns 000000, because it only accepts integer parameters, and DateTime::format() only supports millisecondsFor example: 654321eTime zone identifierFor example: UTC, GMT, Atlantic/AzoresI (capital "i") Whether it is daylight saving timeDaylight saving time is 1, otherwise it is 0OThe number of hours difference from Greenwich Time For example: 0200PThe difference from Greenwich Mean Time (GMT), hours and minutes are separated by colonsFor example: 02:00 TThe time zone where this machine is locatedFor example: EST, MDT (complete text format under windows, such as "Eastern Standard Time" , the Chinese version will display "China Standard Time") ZThe number of seconds of the time difference offset, the time zone offset west of UTC is always negative, Time zone offsets east of UTC are always positive -43200 to 43200c Dates in ISO-8601 format2014-02-12T15:19:21 00:00rDate in RFC 822 formatFor example: Thu,21 Dec 2000 16:01:07 0200UThe number of seconds since the UNIX epoch (January 1 1970 00:00:00 GMT) Returns the same timestamp as time()

扩展知识：

在 PHP 中是通过日期和时间函数来获取日期和时间的。日期和时间函数依赖于服务器的时间设置，服务器的时间设置默认是格林尼治时间（零时区时间），如果不特意设置时间为特定时区时间，那么通过 PHP 有关函数获取到的时间为零时区的时间，比北京时间少 8 个小时。

PHP 中可使用 ini_set() 函数设置指定配置选项的值，这个配置选项会在脚本运行时保持新的值，并在脚本结束时恢复。函数的语法格式如下：

ini_set($varname, $newvalue)

其中 $varname 为待修改的配置选项，$newvalue 为配置选项的新值。

提示：ini_set() 函数并不能修改所有的配置选项，可以通过访问“https://www.php.net/manual/zh/ini.list.php”来查看可以修改的配置选项。

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Characters	Description	Return value example
d	in the month The day of the week is represented by two digits. If there are less than two digits, add 0	01 to 31
The English abbreviation of the month	Jan to Dec
Use numbers to represent the current month	1 to 12
Specify the number of days in the month	28 to 31
Whether the specified year is a leap year	If it is a leap year, the value is 1, otherwise it is 0
Use numbers to represent the year according to the ISO-8601 standard format, which is the same as Y. Same (new in PHP 5.1.0)	1999 or 2019
Use 4 digits to represent the complete year	For example: 1999 or 2019
Use 2 digits to represent the year	For example: 99 or 03
Lowercase AM and PM values	am or pm

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