PHP Date-time function date ()
1, year-month-day
Copy Code code as follows:
echo Date (' y-m-j ');
2007-02-6
echo Date (' y-n-j ');
07-2-6
Capital Y represents a four-digit year, while lowercase y represents a two-digit number for the year;
Lowercase m represents the number of months (with leading), while lowercase n indicates the number of months without leading.
Copy Code code as follows:
echo Date (' y-m-j ');
2007-feb-6
echo Date (' y-m-d ');
2007-02-06
Uppercase M represents the 3 abbreviations for the month, while lowercase m represents the number of months (with a leading 0);
There is no uppercase J, only lowercase J indicates the date of the month, no leading o, and lowercase D if you want the month band leading.
Copy Code code as follows:
echo Date (' y-m-j ');
2007-feb-6
echo Date (' Y-f-js ');
2007-february-6th
Capital M represents the 3 abbreviations of the month, while capital F indicates the full English of the month. (No lowercase f)
Uppercase S represents the suffix of a date, such as "St", "nd", "rd", and "th", depending on the date number.
Summary:
Indicates that the year can be in uppercase Y and lowercase y;
Indicates that the month can be in uppercase F, uppercase M, lowercase m, and lowercase n (two ways of representing characters and numbers, respectively);
Indicates that the day can be a suffix of a date with lowercase d and lowercase j, uppercase S.
2, when: minutes: seconds
By default, PHP interprets the time as "Greenwich Mean Time", which is 8 hours away from our local time.
Copy Code code as follows:
echo Date (' g:i:s a ');
5:56:57 am
echo Date (' H:i:s A ');
05:56:57 AM
Lowercase g represents a 12-hour system with no leading 0, while lowercase h indicates a 12-hour system with a leading 0.
When using a 12-hour system, you need to indicate that in the afternoon, lowercase a is the lowercase "am" and "PM", and capital a denotes "AM" and "PM" uppercase.
Copy Code code as follows:
echo Date (' g:i:s ');
14:02:26
Capital G represents 24 hours of hours, but not leading; use uppercase H to indicate a 24 hour system with a leading number of hours
Summary:
The letter G indicates that the hour is not leading, and the letter H denotes the hour with leading;
Lowercase g, h means 12-hour system, capital G, H is 24-hour system.
3, Leap year, week, day
Copy Code code as follows:
echo Date (' L ');
Whether this year leap years: 0
echo Date (' L ');
Today is: Tuesday
echo Date (' D ');
Today is: Tue
Capital L indicates whether a leap year is a Boolean value that returns 1 for true or 0;
Lowercase L means the day is the week of the English full write (Tuesday);
Instead, use uppercase D to denote the 3-character abbreviation for the Day of the Week (Tue).
Copy Code code as follows:
echo Date (' W ');
Today's Week: 2
echo Date (' W ');
This week is the No. 06 week of the year.
The lowercase w represents the day of the week, the number form represents
Capital W indicates the number of weeks in a year
Copy Code code as follows:
echo Date (' t ');
This month is 28 days
echo Date (' Z ');
Today is the 36th day of the year.
Lowercase T represents the current month and how many days
Lowercase Z means today is the first day of the year
4, other
echo Date (' T ');
Utc
Capital T indicates the time zone setting of the server
echo Date (' I ');
0
Capital I indicates whether the current is daylight saving time, returns 1 for true, or 0
echo Date (' U ');
1170769424
The capital U represents the total number of seconds from January 1, 1970 to the present, which is the Unix time stamp for the Unix time era.
echo Date (' C ');
2007-02-06t14:24:43+00:00
Lowercase C represents the ISO8601 date, the date format is YYYY-MM-DD, the date and time is separated by the letter T, the time format is HH:MM:SS, and the time zone uses the deviation of Greenwich Mean Time (GMT).
echo Date (' R ');
Tue, Feb 2007 14:25:52 +0000
Lowercase R represents the RFC822 date.
The small date () function shows PHP's powerful features and charming charm, and then compare the ASP, hehe.
php datetime Function Date Time: How to display the system's current time and clock synchronization
A simple way to tell you: <?php echo Date ("Y-m-d h:i:s", Time ());?>
Results: 2009-10-06 16:21:38
Time () function: Displays the system current times.
Date () function: Formats the time of the server.
Syntax: string date (string format, int [timestamp]);
Function Type: time date
return value: String
The parameters are as follows:
A-"AM" or "PM"
A-"AM" or "PM"
D-A few days, two digits, if less than two digits before the 0; such as: "01" to "31"
D-Days of the week, three English letters; such as: "Fri"
F-month, full name in English; such as: "January"
Hours of h-12 hours; such as: "01" to "12"
H-24 hours of hours; such as: "00" to "23"
G-12 hours, less than two-bit not to fill 0; such as: "1" to 12 "
G-24 hours of hours, less than two to fill 0; such as: "0" to "23"
I-minute; such as: "00" to "59"
J-A few days, two digits, if less than two digits do not fill 0; such as: "1" to "31"
L-Days of the week, full name in English; such as: "Friday"
M-month, two digits, if less than two digits in front of the 0; such as: "01" to "12"
N-month, two digits, if less than two digits will not fill 0; such as: "1" to "12"
M-month, three English letters; such as: "The"
S-seconds; such as: "00" to "59"
S-word tail plus English ordinal number, two English letters; such as: "th", "nd"
T-Specifies the number of days of the month; such as: "28" to "31"
U-Total number of seconds
W-Number of days of the week, such as: "0" (Sunday) to "6" (Saturday)
Y-year, four digits; such as: "1999"
Y-year, two digits; such as: "99"
Z-the day ordinal of the year; such as: "0" to "365"
If the time displayed is inconsistent with the system, change the php.ini configuration file.
The system defaults to UTC time
can open Php.inc
Set Date.timezone = PRC
Advanced application Techniques for PHP date-time functions
PHP's date-time function, which describes the simple use of the PHP date-time function, will introduce more functions to enrich our application.
Checkdate ($month, $date, $year)
If the value that is applied constitutes a valid date, the function returns True. For example, for an error date of February 31, 2005, this function returns to False.
You can use this function to check the date and make the date effective before the date is calculated or saved in the database.
Copy Code code as follows:
<?php
Returns false
echo checkdate (2,30,2005)? "Valid": "Invalid";
Returns True
echo checkdate (4,6,2010)? "Valid": "Invalid";
?>
GETDATE ($ts)
In the absence of an argument, the function returns the current date and time in a associative array. Each element in the array represents a specific component in the date/time value. You can submit an optional time label argument to a function to get the date/time value that corresponds to the time label.
This function is used to obtain a series of discrete, easily separated date/time values.
Copy Code code as follows:
<?php
Get date as associative array
$arr = getdate ();
echo "Date is". $arr [' Mday ']. " " . $arr [' Weekday ']. " " . $arr [' Year '];
echo "Time is". $arr [' hours ']. ":" . $arr [' minutes '];
?>
mktime ($hour, $minute, $second, $month, $day, $year)
The function is the opposite of getdate (): It generates a UNIX time label from a series of date and time values (the number of seconds from GMT January 1, 1970 to the current elapsed). When the argument is not used, it generates the UNIX time label for the current time.
Use this function to get the UNIX time label for the instant time. This time tag is commonly used in many database and program languages.
Copy Code code as follows:
<?php
Returns timestamp for 13:15:23 7-jun-2006
echo Mktime (13,15,23,6,7,2006);
?>
Date ($format, $ts)
This function formats the UNIX time label as a date string that can be read artificially. It is the most powerful function in the PHP date/Time API, and can be used in a series of correction values to convert the integer time label to the desired string format.
This function is applied to display the formatting time or date.
Copy Code code as follows:
<?php
Format Current Date
Returns "13-sep-2005 01:16 PM"
echo Date ("D-m-y h:i A", Mktime ());
?>
Strtotime ($STR)
This function converts an English date/time string that can be artificially read into a UNIX time label.
Apply this function to convert an nonstandard date/time string into a standard, compatible UNIX time label.
Copy Code code as follows:
<?php
Returns 13-sep-05
echo Date ("D-m-y", Strtotime ("Today"));
Returns 14-sep-05
echo Date ("D-m-y", Strtotime ("Tomorrow"));
Returns 16-sep-05
echo Date ("D-m-y", Strtotime ("Today +3"));
?>
strftime ($format, $ts)
As defined by the previous setlocale () function, this function formats the UNIX time label as a date string that applies to the current environment.
Apply this function to establish a date string that is compatible with the current environment.
Copy Code code as follows:
<?php
Set Locale to France (on Windows)
SetLocale (Lc_time, "Fra_fra");
Format month/day Names
As per locale setting
Returns "Septembre" and "mardi"
Echo strftime ("Month:%B");
echo strftime ("Day:%A");
?>
Microtime ()
As defined by the previous setlocale () function, this function formats the UNIX time label as a date string that applies to the current environment.
Apply this function to establish a date string that is compatible with the current environment.
Copy Code code as follows:
<?php
Get starting value
$start = Microtime ();
Run some code
For ($x =0 $x <1000; $x + +) {
$null = $x * $x;
}
Get ending value
$end = Microtime ();
Calculate time taken for code execution
echo "Elapsed time:". ($end-$start). " SEC ";
?>
gmmktime ($hour, $minute, $second, $month, $day, $year)
This function generates a UNIX time label from a series of date and time values expressed in GMT time. When you do not use a variable, it generates a UNIX time label for the current GMT instant time.
Use this function to obtain the UNIX time label for GMT Instant time.
Copy Code code as follows:
<?php
Returns timestamp for 12:25:23 9-jul-2006
echo Gmmktime (12,25,23,7,9,2006);
?>
Gmdate ($format, $ts)
This function formats the UNIX time label as a date string that can be read artificially. This date string is represented as GMT (not local time).
This function is applied when the time label is represented by GMT.
Copy Code code as follows:
<?php
Format current date into GMT
Returns "13-sep-2005 08:32 AM"
Echo gmdate ("D-m-y h:i A", Mktime ());
?>
Date_default_timezone_set ($tz), Date_default_timezone_get ()
This function then all the date/time function calls set and restores the default time zone.
Note: This function is only valid in PHP 5.1+.
This function is a convenient shortcut for setting a time zone for future time operations.
Copy Code code as follows:
<?php
Set TimeZone to UTC
Date_default_timezone_set (' UTC ');
?>
