Date Function

1.date : The PHP function formats a timestamp to a more readable date and time. The required format parameter in the date() function specifies how to format the date/time.

Syntax: date(“date formate”)

Date formate:DAYS

d - day of the month 2 digits (01-31) j - day of the month (1-31)

D - 3 letter day (Mon - Sun)

l - full name of day (Monday - Sunday) N - 1=Monday, 2=Tuesday, etc (1-7)

S - suffix for date (st, nd, rd)

w - 0=Sunday, 1=Monday (0-6) z - day of the year (1=365)            MONTH

F - Full name of month (January - December) m - 2 digit month number (01-12)

n - month number (1-12)

M - 3 letter month (Jan - Dec) t - Days in the month (28-31)

WEEK

W - week of the year (1-52)

YEAR      TIME

L - leap year (0 no, 1 yes)              a - am or pm

o - ISO-8601 year number (Ex. 1979, 2006)            A - AM or PM

Y - four digit year (Ex. 1979, 2006)             B - Swatch Internet time (000 - 999)

y - two digit year (Ex. 79, 06)       g - 12 hour (1-12)

                G - 24 hour c (0-23)

                h - 2 digit 12 hour (01-12)

                H - 2 digit 24 hour (00-23)

                i - 2 digit minutes (00-59)

                s 0 2 digit seconds (00-59)

2.  getdate : The function returns date/time information of a timestamp or the current local date/time.

Syntax: array getdate()

<?php

print_r(getdate());

?>

Output: //Array ( [seconds] => 57 [minutes] => 17 [hours] => 13 [mday] => 3 [wday] => 3 [mon] => 7 [year] => 2013 [yday] => 183 [weekday] => Wednesday [month] => July [0] => 1372850277 )

3. setdate : The function is used to set the user define date it takes three arguments.

Syntax: void setdate(integer year,integer month, integer day)

<?php

$date = new DateTime();

$date->setDate(2001, 2, 3);

echo $date->format('Y-m-d'); //2001-02-03

?>

3.   setdate : The function is used to set the user define date it takes three arguments.

Syntax: void setdate(integer year,integer month, integer day)

<?php

$date = new DateTime();

$date->setDate(2001, 2, 3);

echo $date->format('Y-m-d'); //2001-02-03

?>

4.  checkdate : The checkdate() function is used to validate a date.

Syntax: bool checkdate(integer month, integer day, integer year)

<?php

if(checkdate(03,20,2010))            //true because it is valid date echo "true";

else

echo "false";

?>

5. time : The time() function returns the current time in the number of seconds since the Unix Epoch (January1 1970 00:00:00 GMT).

Syntax: datetime time()

<?php

$t=time();

echo($t . "<br>");            //1372852042 echo(date("Y-m-d",$t)); //2013-07-03

?>

6.   mktime : The mktime() function returns the Unix timestamp for a date.

Syntax: mktime(hour,minute,second,month,day,year,is_dst);

<?php

echo date("d:m:y",mktime(0,0,0,10,3,1975)); //03:10:75

?>

7.  date_add : The date_add() function adds some days, months, years, hours, minutes, and seconds to a date.

Syntax: date_add(object,interval);

<?php

$date=date_create("2013-03-15");
date_add($date,date_interval_create_from_date_string("40 days"));            // 2013-04-24 echo date_format($date,"Y-m-d");

?>

8. date_create : The function Return a new DateTime object, and then format the date.

Syntax: date_create(time,timezone);

9.  date_format : The date_format() function returns a date formatted according to the specified format.

Syntax: date_format(object,format);

<?php

$date=date_create("2013-03-15");

echo date_format($date,"Y/m/d H:i:s");               // 2013/03/15 00:00:00

?>

10.   gmdate : The function formats a GMT/UTC date and time, and returns the formatted date string.

Syntax: gmdate(format,timestamp);

<?php
echo gmdate("l") . "<br>";// Wednesday
echo gmdate("l jS \of F Y h:i:s A"); // Wednesday 3rd of July 2013 05:52:40 PM
?>

11.  localtime : The function returns the local time. Returns an array that contains the components of a Unix timestamp.

Syntax: localtime();

          <?php print_r(localtime());

       ?>

Output:

Array ( [0] => 58 [1] => 57 [2] => 19 [3] => 3 [4] => 6 [5] => 113 [6] => 3 [7] => 183 [8] => 1 )

12. strftime : The strftime() function formats a local time and/or date according to locale settings.

Syntax: gmdate(format,timestamp);

           

	<?php echo(strftime("%Y. %B %d. %A. %X %Z")); ?> Output: 2013. July 03. Wednesday. 8:02:30 PM India Standard Time
format ·     %a - abbreviated weekday name ·     %A - full weekday name ·     %b - abbreviated month name ·     %B - full month name ·     %c - preferred date and time representation ·     %C - century number (the year divided by 100, range 00 to 99) ·     %d - day of the month (01 to 31) ·     %D - same as %m/%d/%y ·     %e - day of the month (1 to 31) ·     %g - like %G, but without the century ·     %G - 4-digit year corresponding to the ISO week number (see %V). ·     %h - same as %b ·     %H - hour, using a 24-hour clock (00 to 23) ·     %I - hour, using a 12-hour clock (01 to 12) ·     %j - day of the year (001 to 366) ·     %m - month (01 to 12) ·     %M - minute ·     %n - newline character		·     %p - either am or pm according to the given time value ·     %r - time in a.m. and p.m. notation ·     %R - time in 24 hour notation ·     %S - second ·     %t - tab character ·     %T - current time, equal to %H:%M:%S ·     %u - weekday as a number (1 to 7), Monday=1. Warning: In Sun Solaris Sunday=1 ·     %U - week number of the current year, starting with the first Sunday as the first day of the first week ·     %V - The ISO 8601 week number of the current year (01 to 53), where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week ·     %W - week number of the current year, starting with the first Monday as the first day of the first week ·     %w - day of the week as a decimal, Sunday=0 ·     %x - preferred date representation without the time ·     %X - preferred time representation without the date ·     %y - year without a century (range 00 to 99) ·     %Y - year including the century ·     %Z or %z - time zone or name or abbreviation ·     %% - a literal % character

13. strptime : The strptime() function parses a time/date generated with strftime().

Syntax: strptime(date,format); //support in after php5.1 version

<?php
$format="%d/%m/%Y %H:%M:%S";
$strf=strftime($format);
 echo("$strf"); print_r(strptime($strf,$format));
?>

14. strtotime : The strtotime() function parses an English textual datetime into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 GMT).

Note: If the year is specified in a two-digit format, values between 0-69 are mapped to 2000-2069 and values between 70-100 are mapped to 1970-2000.

Note: Be aware of dates in the m/d/y or d-m-y formats; if the separator is a slash (/), then the American m/d/y is assumed. If the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed. To avoid potential errors, you should YYYY-MM-DD dates or date_create_from_format() when possible.

   <?php

echo(strtotime("now")."<br>");

echo(strtotime("3 October 2005")."<br>");

echo(strtotime("+5 hours")."<br>");

echo(strtotime("+1 week")."<br>");

echo(strtotime("+1 week 3 days 7 hours 5 seconds")."<br>");

echo(strtotime("next Monday")."<br>");

echo(strtotime("last Sunday"));

?>

Syntax: strtotime(time);

Output: it will in seconds from 1-1-1970

15.  gettimeofday : The gettimeofday() function returns the current time.

Syntax: array gettimeofday();

<?php

print_r(getdayoftime());

?>

Output:

Array ( [sec] => 1372875405 [usec] => 447070 [minuteswest] => -120 [dsttime] => 1 ) 1372875405.4635