strftime is a common date and time acquisition function in PHP, which converts numbers stored in the database into time. Here we will introduce the usage and parameters of the strftime function. Friends who need it can refer to it

Usage of strftime() function

The strftime() function can convert date strings in YYYY-MM-DD HH:MM:SS format into other forms of strings.
The syntax of strftime() is strftime(format, date/time, modifier, modifier, ...)

The operation of function strftime() is somewhat similar to sprintf(): recognize in percent A collection of format commands starting with a sign (%). The formatted output results are placed in a string. The formatting command specifies the exact representation of various date and time information in the string strDest. The other characters in the format string are put into the string as they are. The format commands are listed below and are case-sensitive.

strftime() definition and usage
strftime() function formats local time/date according to regional settings.

strftime() Syntax
strftime(format, timestamp) Parameter Description
format Optional. Specifies how results are returned.
timestamp Optional.
Tips and Notes
Tip: Same behavior as gmstrftime(), except that the returned time is local time.

It can use the following symbols to format dates and times:

%a Abbreviation of the day of the week
%A Full name of the day of the week
%b Month The abbreviation of
%B The full name of the month
%c The standard date time string
%C The first two digits of the year
%d The day of the month in decimal notation
% D month/day/year
%e In a two-character field, the day of the month in decimal format
%F year-month-day
%g The last two digits of the year, using Year of the week
%G Year, using the year based on the week
%h Abbreviated month name
%H Hour in 24-hour format
%I Hour in 12-hour format
%j Decimal The day of the year represented
%m The month represented by the decimal system
%M The number of minutes represented by the ten-hour system
%n New line character
%p The equivalent display of local AM or PM
%r 12-hour time
%R Display hours and minutes: hh:mm
%S Decimal seconds
%t Horizontal tab
%T Display hours, minutes and seconds: hh :mm:ss
%u The day of the week, Monday is the first day (value is from 1 to 7, Monday is 1)
%U The week of the year, Sunday is the first day Day (values ??from 0 to 53)
%V Week of the year, using week-based year
%w Day of the week in decimal notation (values ??from 0 to 6, Sunday is 0)
% W The week of the year, with Monday as the first day (value from 0 to 53)
%x Standard date string
%X Standard time string
%y Decimal without century Year (values ??from 0 to 99)
%Y Decimal year with century part
%z, %Z Time zone name, if the time zone name cannot be obtained, a null character is returned.
%% Output percent sign

The usage example of strftime() is as follows:

select strftime('%Y-%m-%d %H: %M:%S','now','localtime');
Result: 2018-5.15 23:58:09
In fact, a better usage is like this, such as system, this month or this year Expenditure:
select strftime('%Y-%m', date) as month, sum (expenditure) as monthly expenditure from journal group by month;

switch usage

<?php
setlocale(LC_TIME,"chs");     //設(shè)置本地環(huán)境
$weekday = strftime("%A");     //聲明變量$weekday的值，獲得了系統(tǒng)時(shí)間并只需要獲取星期幾
switch ($weekday){     //switch語句，判斷$weekday的值
 case "星期一":     //如果變量的值為“星期一”
 echo "今天是$weekday ，新的一天開始了！";
 break;
 case "星期二":     //如果變量的值為“星期二”
 echo "今天是$weekday ，認(rèn)真的工作態(tài)度真的很重要!";
 break;
 case "星期三":     //如果變量的值為“星期三”
 echo "今天是$weekday ，充實(shí)生活，努力工作！";
 break;
 case "星期四":     //如果變量的值為“星期四”
 echo "今天是$weekday ，勤奮才能創(chuàng)造績效，加油?。?quot;;
 break;
 case "星期五":     //如果變量的值為“星期五”
 echo "今天是$weekday ，積極完成工作任務(wù)！";
 break;
 case "星期六":     //如果變量的值為“星期六”
 echo "今天是$weekday ，可以放松心情了！";
 break;
 default:      //默認(rèn)值
 echo "今天是$weekday , 去happy一下！";
 break;
}
?>

The editor of Script House will continue to add some examples for you:

<?php
echo(strftime("%b %d %Y %X", mktime(20,0,0,12,31,98)));
echo(gmstrftime("%b %d %Y %X", mktime(20,0,0,12,31,98)));

//輸出當(dāng)前日期、時(shí)間和時(shí)區(qū)
echo(gmstrftime("It is %a on %b %d, %Y, %X time zone: %Z",time()));
?>

Output:

Dec 31 1998 20:00:00
Dec 31 1998 19:00:00

Get the unix timestamp of the specified date strtotime("2009-1-22") The example is as follows:
echo strtotime("2009-1-22") Result: 1232553600
Description: Return the timestamp of 0:00:00 on January 22, 2009

2. An example of obtaining the English text date and time is as follows:
For comparison, use date to convert the current timestamp and the specified timestamp into system time

(1) Print the timestamp at this time tomorrow strtotime(" 1 day")
Current time: echo date("Y-m-d H:i:s",time()) Result: 2009-01-22 09:40:25
Specify time: echo date("Y-m-d H:i:s",strtotime(" 1 day ")) Result: 2009-01-23 09:40:25

(2) Print the timestamp of yesterday at this time strtotime("-1 day")
Current time: echo date("Y-m-d H:i:s",time()) Result: 2009-01-22 09:40:25
Specified time: echo date("Y-m-d H:i:s",strtotime("-1 day")) Result: 2009-01-21 09:40:25

(3) Print the timestamp at this time next week strtotime(" 1 week")
Current time: echo date("Y-m-d H: i:s",time()) Result: 2009-01-22 09:40:25
Specify time: echo date("Y-m-d H:i:s",strtotime(" 1 week")) Result: 2009 -01-29 09:40:25

(4) Print the timestamp at this time last week strtotime("-1 week")
Current time: echo date("Y-m-d H:i: s",time()) Result: 2009-01-22 09:40:25
Specify time: echo date("Y-m-d H:i:s",strtotime("-1 week")) Result: 2009- 01-15 09:40:25

(5) Print the timestamp of the specified day of the week strtotime("next Thursday")
Current time: echo date("Y-m-d H:i:s", time()) Result: 2009-01-22 09:40:25
Specify time: echo date("Y-m-d H:i:s",strtotime("next Thursday")) Result: 2009-01-29 00 :00:00

(6) Print the timestamp of the specified day of the week strtotime("last Thursday")
Current time: echo date("Y-m-d H:i:s",time()) Result: 2009-01-22 09:40:25
Specified time: echo date("Y-m-d H:i:s",strtotime("last Thursday")) Result: 2009-01-15 00:00:00

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