Two date comparison program code in php_PHP tutorial
WBOYOriginal
2016-07-13 10:55:30844browse
In fact, there are many ways to compare two dates in PHP. The most common one I use is to use the strtotime function to convert the date into a number, and then add and subtract it. Let’s see an example below.
/*
* Author: I don’t know who the author is
* Date: 2008-4-13
* Function: Calculate the time difference between two dates
* Remarks: Basically the program code has not been modified, only the writing has been standardized and comments have been made // Mancharo
*/
// Define the two dates to compare
$Date_1="2008-7-15";
$Date_2="2006-7-14";
//Convert the date into an array to make a timestamp
$Date_List_1=explode("-",$Date_1);
$Date_List_2=explode("-",$Date_2);
/*
* Author: Mancharo
* Date: 2008-4-13
* Function: Calculate the time difference between two dates
*/<🎜>
<🎜>// Use PHP’s built-in function strtotime to format the date as a timestamp
$date1_ts = strtotime("2008-7-15");
$date2_ts = strtotime("2006-7-14");<🎜>
<🎜>// Date comparison
$days=round(($date1_ts-$date2_ts)/3600/24);<🎜>
<🎜>//Output results
echo "$days days";
?>
Function
Description
Examples
checkdate($month, $date, $year)
This function returns true if the applied value forms a valid date. For example, for the error date February 31, 2005, this function returns false.
This function can be used to check and validate a date before it is used in calculations or saved in the database.
// returns false
echo checkdate(2,30,2005) ?
"valid" :
"invalid";
// returns true
echo checkdate(4,6,2010) ? "valid" :
"invalid";
?>
getdate($ts)
With no arguments, this function returns the current date and time in a combined array. Each element in the array represents a specific component of the date/time value. An optional time stamp argument can be submitted to the function to obtain a date/time value corresponding to the time stamp.
Apply this function to obtain a series of discrete, easily separable date/time values.
// returns timestamp for
13:15:23
7-Jun-2006
echo mktime(13,15,23,6,7,2006);
?>
mktime($hour,
$minute,
$second,
$month, $day,
$year)
This function does the opposite of getdate(): it generates a UNIX time stamp from a series of date and time values (the number of seconds that have elapsed since January 1, 1970 GMT ). When no arguments are used, it generates a UNIX time stamp of the current time.
Use this function to obtain the UNIX time label of the immediate time. Such timestamps are commonly used in many databases and programming languages.
// returns timestamp for
13:15:23
7-Jun-2006
echo mktime(13,15,23,6,7,2006);
?>
date($format, $ts)
This function formats a UNIX time stamp into a human-readable date string. It is the most powerful function in the PHP date/time API and can be used to convert integer time labels into the required string format in a series of correction values.
Apply this function when formatting time or date for display.
// format current date
// returns "13-Sep-2005 01:16 PM"
echo date("d-M-Y h:i A", mktime
());
?>
strtotime ($str)
This function converts a human-readable English date/time string into a UNIX time tag.
Apply this function to convert a non-standardized date/time string into a standard, compatible UNIX time tag.
// 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
days"));
?>
strftime ($format, $ts)
As defined by the previous setlocale() function, this function formats the UNIX time stamp into a date string suitable for the current environment.
Apply this function to create a date string compatible with the current environment.
// 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()
This function returns the number of seconds and microseconds that have elapsed since January 1, 1970, GMT time.
Apply this function when benchmarking a specific block of code to accurately measure its execution time.
// 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,
$year)
This function generates a UNIX time stamp from a series of date and time values expressed in GMT time. When no arguments are used, it generates a UNIX time stamp of the current GMT time.
Use this function to obtain the UNIX time label of GMT real-time time.
// returns timestamp for
12:25:23
9-Jul-2006
echo gmmktime
(12,25,23,7,9,2006);
?>
gmdate ($format, $ts)
This function formats a UNIX time stamp into a human-readable date string. This date string is expressed in GMT (not local time).
This function is applied when the time label is expressed in GMT.
// format current date into GMT
// returns "13-Sep-2005 08:32
AM"
echo gmdate("d-M-Y h:i A",
mktime());
?>
date_default_
timezone_set
($tz)and
date_default_
timezone_get()
All date/time function calls after this function set and restore the default time zone.
Note: This function is only valid in PHP 5.1+.
This function is a convenient shortcut for setting the time zone for future time operations.
// set timezone to UTC
date_default_timezone_set
('UTC');
?>
http://www.bkjia.com/PHPjc/632222.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632222.htmlTechArticleIn fact, there are many ways to compare two dates in php. The most common one I use is to use the strtotime function to compare the dates. Convert it into numbers, and then add and subtract them. Let's see an example below. The code is as follows...
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