Preg match php дата

Validate that input is in this time format — «HH:MM» [closed]

sorry, but really? reading this without a comment is bah. why not use something as simple as this: $dateObj = DateTime::createFromFormat(‘d.m.Y H:i’, «10.10.2010 » .$timeStr); if ($dateObj !== false) < // valid time>else < //invalid time>but yeah, give +14 upvotes for reinventing the wheel

@Toskan: I think that’s a fine way to do it. I tried to follow the OP’s request to use preg_match , even though I don’t know the reasoning behind it. I know that I’ve asked questions before and had people tell me that I shouldn’t do what I was asking to do (rather than tell me how to do it) and it bothered me — of course I had a reason for asking for what I wanted. I don’t know what this poster’s reasoning is: maybe they’re using GeSHi to format dates in their language and so DateTime::createFromFormat isn’t available. Or maybe they’re just learning regex. I don’t know.

Simple function that validates a date (and/or time) without throwing exceptions. It takes the expected date format as a parameter:

function isValidDate(string $date, string $format = 'Y-m-d'): bool < $dateObj = DateTime::createFromFormat($format, $date); return $dateObj && $dateObj->format($format) == $date; > 

How it works: it converts the input date into a PHP DateTime object according to the passed $format , then compares this object with the original input date. If they match, the date is valid and has the expected format.

/* Valid Examples: */ isValidDate("2017-05-31"); isValidDate("23:15:00", 'H:i:s'); isValidDate("2017-05-31 11:15:00", 'Y-m-d h:i:s'); /* Invalid: */ isValidDate("2012-00-21"); isValidDate("25:15:00", 'H:i:s'); isValidDate("Any string that's not a valid date/time"); 

This is the best one. I don’t see why other people are using regex when there is an official DateTime Class. You know why? Some other people spent their time, and when a class is the official one provided for a language, usually it has been tested so many times, plus, it will for sure be generic, and considering international issues. Expecially when you’re dealing with date and times. Those people worked hours, consuming human and electrical energy. Don’t waste both, it’s the basis for a good developer 😉 I know, it’s an heavy tought, but it’s right

This can be used as a simple true/false check. The return value is false or an instance of the dateTime object, so a simple if(DateTime::createFromFormat(‘H:i’,$time)) is good for a lot of cases.

@Snapey the main problem with that approach is that createFromFormat accepts «stupid» values like month 13, or day 0. The date 2000-13-00 will be considered valid as it parses it as 2000-12-31.

Let’s imagine the time you want to check is $timeStr and has to be the format H:i according to the date specs. Using a regex for this is IMHO silly. This is so much easier to read:

$timeStr = " 02:00"; //example of valid time, note whitespace test($timeStr); $timeStr = "23:59"; //valid test($timeStr); $timeStr = "24:00"; //invalid test($timeStr); $timeStr = "25:00"; //invalid test($timeStr); $timeStr = "16:61"; // invalid test($timeStr); //tests 23:59 hour format function test($timeStr)< $dateObj = DateTime::createFromFormat('d.m.Y H:i', "10.10.2010 " . $timeStr); if ($dateObj !== false && $dateObj && $dateObj->format('G') == intval($timeStr))< //return true; echo 'valid 
'; > else< //return false; echo 'invalid 
'; > > 

Create an offSet date and validate against it to remove inputs like 25:00. $dateObjOffset = DateTime::createFromFormat(‘d.m.Y H:i’, «10.10.2010 » . ’24:00′); if($dateObjOffset

@LakshithaUdara good solution if for the case you want to have 24:00 as valid time, i added a solution for valid until 23:59 that is a bit simpler

Function that validates hours, minutes and seconds, according to the desired format:

function validTime($time, $format='H:i:s') < $d = DateTime::createFromFormat("Y-m-d $format", "2017-12-01 $time"); return $d && $d->format($format) == $time; > 

How to use:

$valid = validTime("23","H"); $valid = validTime("23:59","H:i"); $valid = validTime("23:59:59","H:i:s"); $valid = validTime("23:59:59"); 

valid = true

$valid = validTime("25","H"); $valid = validTime("01:60","H:i"); $valid = validTime("01:20:61","H:i:s"); $valid = validTime("01:20:61"); 

valid = false

You don’t need to hardcode «Y-m-d» and «2017-12-01» there, it just makes it more complicated to understand and less flexible imo

T30 says the truth, I’ve just tested. Btw, I don’t see why other people are using regex when there is an official DateTime Class. You know why? Some other people spent their time, and when a class is the official one provided for a language, usually it has been tested so many times, plus, it will for sure be generic, and considering international issues. Expecially when you’re dealing with date and times. Those people worked hours, consuming human and electrical energy. Don’t waste both, it’s the basis for a good developer 😉 I know, it’s an heavy tought, but it’s right.

@Funder The basis of good software engineering is using code the software engineer knows works. Many coders are scared of regex’s complexity. It takes real commitment to understand regex. PHP is a great language, but I have run into several PHP bugs. That’s what bug reporting is for. «usually it has been tested so many times, plus, it will for sure be generic, and considering international issues.» This is the «the guy I don’t know is always smarter than I» fallacy. Just about every PHP manual page has error and issue discussions below the description, including the DateTime class.

Источник

Date regex PHP

Date regular expressions can be used to validate if a string has a valid date format and to extract a valid date from a string.

Simple date regex (DD/MM/YYYY)

Below is a simple regex to validate the string against a date format (D/M/YYYY or M/D/YYYY). This however does not guarantee that the date would be valid. You can also replace \\/ with a separator you need.

Enter a text in the input above to see the result

$year = $1; $month = $2; $day = $3; $hour = $4; $minute = $5; $second = $6; 

preg_match("#^29*111*11962?#", $date); 

// Make the tor_from date look nicer $nice_from = $_POST['tor_from']; $matches = array(); $ideal_from = ''; preg_match('/\d\\d\\d\/', $nice_from, $matches, PREG_OFFSET_CAPTURE, 0); // if (isset($matches[0])) $nice_from = $matches[0]; echo $matches[0]; echo "
"; echo $matches[1]; echo "
"; echo $matches[2]; echo "
"; echo $matches[3]; echo "
";