Introduction to PHP Tutorial date and time Operational skills Summary (format, validation, acquisition, conversion, calculation, etc.) _php tips

This example describes the PHP date and time manipulation techniques. Share to everyone for your reference, specific as follows:

demo1.php

<?php
 //Verification Time
 //checkdate () 1. Month 2.3 year
 //checkdate () to determine whether this date is a valid date
 //illegal date, try
 if ( Checkdate (7,16,2010)) {
  echo ' This date is legally valid ';
 } else{
  Echo ' This date is illegal. ';
 }
? >

demo2.php

<?php
 //date--format a local time/date
 //date (), thoroughly study
 //date () can hold two parameters, the first parameter is the format of date and time, [second parameter is timestamp]
 / /y represents a four-digit year, Y represents a two-digit year
 //m the month abbreviation for English, M is the month of the Arabic numerals, and the
 //d of the week in English indicates the day of the Arabic numerals.
 The first parameter can be formatted with a number of unimportant strings
 ////As long as the irrelevant string is no longer in the format directory, it will not be recognized
 //echo date (' Now is: y-m-d '); Now the date is: 2015-04-20//moment
 = H means 24 hours of hours,
 //Clearly is 19, why show 11 points, East eight area, difference 8 hours
 //Now without any settings, so time in the default timezone
 / /echo date (' Now is: y-m-d h:i:s ');
 The emphasis is on the day of the month, time of the second
 echo date (' R ');
 echo Date (' Today's date is: y-m-d H:i:sa ');
? >

demo3.php

<?php
 //Get current time, return an array
 //"SEC"-number of seconds since the Unix era
 //"USEC"-microseconds
 //"Minuteswest"-number of minutes to the west of Greenwich
 // Dsttime "-Daylight Saving Time modified type
 //print_r (Gettimeofday ());
 The element of the first array is the timestamp
 //gettimeofday () is the timestamp
 //$a = Gettimeofday () of the current time obtained;
 SEC gets the time stamp of the current time//
 Convert the time//second parameter that the adult can understand,
 for this example, put and not put, is the same.
 //echo Date (' y-m-d h:i:s ', $a [' sec ']);
 Print_r (gettimeofday (0));
 echo gettimeofday (1);
? >

demo4.php

<?php//Convert timestamp to the time the
 adult can see the
 second parameter of the//date () function is the timestamp
 ///If the second argument is omitted, then the current time is returned
 //If the second argument is not omitted, Then return that timestamp time of
 echo date (' y-m-d h:i:s ', 24554457865);
? >

demo5.php

<?php
 //getdate () can also convert timestamp
 //print_r (getdate ());
 Array ([seconds] => [minutes] => [hours] => [Mday] => [wday] => 1 [Mon] => 4
 //[year] => 2015 [yday] => 109 [weekday] => Monday [month] => April [0] => 1429526066)
 $t = getdate ();
 echo $t [' Year '];
 Pass a timestamp
 print_r (getdate (1029526066));
? >

demo6.php

<?php
 //Direct Get the current timestamp
 //echo time ();//1429526328//
 this time () can be adjusted to date/
 //You can find times () very useful, Can past now and future
 echo date (' y-m-d h:i:s ', Time () +60*60*8);
? >

demo7.php

<?php
 //Get timestamp for a specified time
 //This is the current timestamp//echo time
 ();
 I want to get 2008-08-08 08:08:08
 $beijing 2008 = mktime (8,8,8,8,8,2008);
 echo Date (' y-m-d h:i:s ', $beijing 2008);
? >

demo8.php

<?php
 //use timestamp to calculate time difference
 $now = times ();//current timestamp
 $wnow = mktime (0,0,0,8,16,2016);
 Two timestamp subtraction can be obtained by the difference sec
 echo Round (($wnow-$now)/60/60,2). ' The difference between these few hours ';
? >

demo9.php

<?php
 //Converts a human-readable time, a string form, to a timestamp
 $a = strtotime (' 2010-7-16 15:15:15 ')-strtotime (' 2010-7-16 15:14:15 ');
 if ($a >=) {
  echo asked this gentleman to take a break. ';
 } else{
  echo $a;
 }
? >

demo10.php

<?php
 //Get current file modification timestamp
 echo date (' y-m-d h:i:s ', Getlastmod ());
? >

demo11.php

<?php
 //configuration system environment variable
 echo date (' y-m-d h:i:s ');
 Echo ' <br/> ';
 I started setting the time zone
 putenv (' Tz=asia/shanghai ');
 echo Date (' y-m-d h:i:s ');
? >

demo12.php

<?php
 //putenv (' Tz=asia/shanghai ');
 Gets the current time zone,
 echo date_default_timezone_get ();
 Echo ' <br/> ';
 Start configuring the default time zone
 date_default_timezone_set (' Asia/shanghai ');
 echo Date (' y-m-d h:i:s ');
 Echo ' <br/> ';
 Echo Date_default_timezone_get ();
? >

demo13.php

<?php
 date_default_timezone_set (' Asia/shanghai ');
 "Tm_sec"-seconds
 //"tm_min"-minutes
 //"Tm_hour"-hours//"
 tm_mday"-Day of the Month//"
 Tm_mon"-months of the year, starting from 0 January
 //"Tm_year"-year, starting from 1900
 //"Tm_wday"-Day of the Week//"
 tm_yday"-Day of the Year
 //"TM_ISDST"-Daylight saving time is currently in effect C23/>print_r (LocalTime (Time (), true));
 Array ([tm_sec] => Notoginseng [tm_min] => [tm_hour] =>//[tm_mday
 ] => [Tm_mon] => 3 [tm_year] => ;
 //[tm_wday] => 1 [tm_yday] => 109 [TM_ISDST] => 0)
?>

demo14.php

<?php
 //return time stamp and microseconds
 //How to calculate the page run load time
 //page open time to get a time/
 //page end time to get a time/
 //////////////////back Timestamp////////// Then it is running time
//list ($a, $b) =explode (", Microtime ());
echo $b;
 function fn () {
  list ($a, $b) =explode (", Microtime ());
  return $a + $b; Returns the exact number of seconds
 }
 //When the page is open, get a time
 $start _time = fn ();
 For ($i =0 $i <10000000; $i + +) {
  //
 }
 //page at the end, get a time
 $end _time = fn ();
 Echo Round (($end _time-$start _time), 4);
? >

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