PHP date and time

timestamp

PHP date() format date

The first required parameter of the date() function, format, specifies how to format the date/time.

Here are some available characters:

d - represents the day of the month (01 - 31)

m - represents the month (01 - 12)

Y - represents the year (four digits)

For a list of all characters available in the format parameter, please consult our PHP Date reference manual, date() function.

You can insert other characters between letters, such as "/", "." or "-", so that you can add additional formats:

Example

<?php
echo date("Y/m/d") . "<br>";
echo date("Y.m.d") . "<br>";
echo date("Y-m-d");
?>

Program running result:

2016/10/09
2016.10.09
2016-10-09

The following characters are commonly used for time:

· h - 12 with leading zero Hour Hour format

· i - minute with leading zero

· s - second with leading zero (00 -59)

· a - lowercase noon and afternoon (am or pm)

Example

The following example outputs the current time in the specified format:

<?php
echo date ("H:i:sa");
?>

The program execution result:

15:53:06pm

☆ The PHP date() function will return the current time/date of the server

Get the time zone

If the time returned from the code is not the correct time, it is possible that your server is located in another country or is set to a different time zone .

So if you need an accurate time based on a specific location, you can set the time zone to use.

The following example sets the time zone to "Asia/Shanghai", and then outputs the current time in the specified format:

<?php
header("Content-type:text/html;charset=utf-8");    //设置编码
date_default_timezone_set("Asia/Shanghai");
echo "当前时间是 " . date("h:i:sa");

?>

The program execution result:

The current time is 03:54:49pm

##Created date via PHP mktime()
## The optional timestamp parameter in the #date() function specifies the timestamp. If you do not specify a timestamp, the current date and time will be used (as in the example above).

The mktime() function returns the Unix timestamp of a date. A Unix timestamp contains the number of seconds between the Unix epoch (January 1, 1970 00:00:00 GMT) and the specified time.

grammar

mktime(hour,minute,second,month,day,year)

The following example A series of parameters in the mktime() function will be used to create the date and time

<?php
header("Content-type:text/html;charset=utf-8");    //设置编码
$d=mktime(9, 12, 31, 6, 10, 2016);
echo "创建日期是 " . date("Y-m-d h:i:sa", $d);
?>

Program running results:

The creation date is 2016-06-10 09:12:31am

Create dates from strings via PHP strtotime()

The PHP strtotime() function is used to convert human Convert the read string to Unix time.

Syntax

##strtotime(time,now)

The following example creates date and time through strtotime() function:

<?php
header("Content-type:text/html;charset=utf-8");    //设置编码
$d=strtotime("10:38pm April 15 2016");
echo "创建日期是 " . date("Y-m-d h:i:sa", $d);
?>

The creation date is 2016-04-15 10:38:00pm

PHP is very smart about converting strings to dates, so you can use a variety of values:

Example

<?php
$d=strtotime("tomorrow");
echo date("Y-m-d h:i:sa", $d) . "<br>";
$d=strtotime("next Saturday");
echo date("Y-m-d h:i:sa", $d) . "<br>";
$d=strtotime("+3 Months");
echo date("Y-m-d h:i:sa", $d) . "<br>";
?>

2016-10-10 12 :00:00am

2016-10-15 12:00:00am
2017-01-09 04:01:09pm

Note: strtotime() It's not perfect, so remember to check the strings you put in it.

Example

<?php
$startdate = strtotime("Saturday");
$enddate = strtotime("+5 weeks",$startdate);
while ($startdate < $enddate) {
    echo date("M d", $startdate),"<br>";
    $startdate = strtotime("+1 week", $startdate);
}
?>

Program running result:

Oct 15

Oct 22
Oct 29
Nov 05
Nov 12

## Example
Use the strtotime() function to obtain the timestamp of the English format date and time string

<?php
header("Content-type:text/html;charset=utf-8");    //设置编码
echo strtotime("now"),"<br>";           //当前时间的时间戳
echo "输出时间：".date("Y-m-d H:i:s",strtotime("now")),"<br>";  //输出当前时间
echo strtotime("24 May 2016"),"<br>";                     //输出指点时间的时间戳
echo "输出时间：".date("Y-m-d H:i:s",strtotime("24 May 2016")),"<br>";     //输入指定的日期
?>

Program execution result:

Output time: 2016-10-09 16:05:00

1464019200
Output time: 2016-05-24 00:00:00

Example

Realizing the countdown function

<?php
header("Content-type:text/html;charset=utf-8");    //设置编码
$time=strtotime(date("Y-m-d H:i:s"));     //当前的系统时间
$time1=strtotime("2017-10-1  12:00:00");  //国庆节的放假时间
$time2=strtotime("2017-1-1");             //元旦的放假时间
$sub=ceil(($time1-$time)/3600);           //（60秒*60分）/小时
$sub1=ceil(($time2-$time1)/86400);        //（60秒*60分*24小时）/天
echo "离国庆放假时间还有　<strong>$sub</strong>　小时";
echo "<p>";
echo"离元旦放假时间还有　<strong>$sub1</strong>　天";
?>

Program running result:

There are -273 days left before the New Year’s Day holiday

For a complete reference manual for all date functions, please visit our Complete PHP Date Reference Manual.

This reference manual provides a brief description and application examples of each function!

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