Date and time of PHP

One, Unix timestamp

Represents Greenwich Mean Time in a 32-bit integer. The UNIX timestamp is the number of seconds that have passed since the start of the January 1, 1970 0 o'clock to the current time.

1. Convert date and time to UNIX timestamp

(1) mktime () function

<?pph

echo Date ("Y-m-d-h-m-s", Mktime (12,10,56,12,67,2016)). " \ n ";

?>

(2) Strtotime () function

<?php

echo Date ("Y-m-d", Strtotime ("Now")). " <br/> ";

echo Date ("Y-m-d", Strtotime ("2014")). " <br/> ";

echo Date ("Y-m-d", Strtotime ("+2 Day")). " <br/> ";

echo Date ("Y-m-d", Strtotime ("last Monday"));

?>
(3) Example: Use strtotime () function to write an anniversary countdown program

<?php

$now =strtotime ("Now");

$endtime =strtotime ("2018-6-19 23:59:59");

$second = $endtime-$now;

$year =floor ($second/60/60/24/365);

$temp = $second-$year *365*24*60*60;

$month =floor ($temp/60/60/24/30);

$temp = $temp-$month *30*24*60*60;

$day =floor ($temp/60/60/24);

$temp = $temp-$day *24*60*60;

$hour =floor ($temp/60/60);

$temp = $temp-$hour *60*60;

$minute =floor ($temp/60);

$second 1= $temp-$minute *60;

echo "graduated from college and". $year. " Year ". $month." Month ". $day." Day ". $hour." Hours ". $minute." ". $second 1." Seconds ";

2. Calculation of dates

<?php

In the PHP script receives the HTML form user submits the birth date, calculates this user's age

$year = 1992;

$month = 11;

$day = 2;

$birthday =mktime (0,0,0, $month, $day, $year); Turn the date of birth into a Unix timestamp

$nowdate =time ();

$ageunix = $nowdate-$birthday;

$age =floor ($ageunix/60/60/24/365);

echo "Your age is". $age. " Years ";

?>

Second, get the date and time in PHP

Third, modify the default time zone of PHP

Iv. Calculation of PHP script execution time using microseconds

<?php

Calculate PHP script execution time using microseconds

Class timer{

Private $startTime = 0;

Private $stopTime = 0;

function Start () {

$this->starttime=microtime (TRUE);

}

function Stop () {

$this->stoptime=microtime (TRUE);

}

function spent () {

Return round (($this->stoptime-$this->starttime), 4);

}

}

$Timer =new Timer ();

$Timer->start ();

Usleep (2000);

$Timer->stop ();

echo "When executing this script". $Timer->spent (). " Seconds ";

?>

Five, Calendar class

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Date and time of PHP