Function to check if a string is a date

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I am trying to write a function to determine if a string is a date/time using PHP. Basically a valid date/time would look like:

 2012-06-14 01:46:28

Obviously though its completely dynamic any of the values can change, but it should always be in form of XXXX-XX-XX XX:XX:XX, how can I write a regular expression to check for this pattern and return true if matched.

If that's your whole string, then just try parsing it:

if (DateTime::createFromFormat('Y-m-d H:i:s', $myString) !== FALSE) {
  // it's a date
}

How to check if a string is date time type in java script., parse is correct to use. As referred from this link, The Date. parse() method parses a string representation of a date, and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC or NaN if the string is unrecognized or, in some cases, contains illegal date values (e.g. 2015-02-31). The following code can be use to validate if a string contains a valid date information. The pattern of the date is defined by the java.text.SimpleDateFormat object. When the date is not valid a java.text.ParseException will be thrown.

Here's a different approach without using a regex:

function check_your_datetime($x) {
    return (date('Y-m-d H:i:s', strtotime($x)) == $x);
}

Check If a String Is a Valid Date in Java, 3. Validate Using DateFormat. Java has provided facilities to format and parse dates since the beginning. This functionality is in the DateFormat� In SQL Server, converting a string to date explicitly can be achieved using CONVERT(). CAST() and PARSE() functions. CAST() CAST() is the most basic conversion function provided by SQL Server. This function tries to convert given value to a specified data type (data type length can only be specified). Example:

In case you don't know the date format:

/**
 * Check if the value is a valid date
 *
 * @param mixed $value
 *
 * @return boolean
 */
function isDate($value) 
{
    if (!$value) {
        return false;
    }

    try {
        new \DateTime($value);
        return true;
    } catch (\Exception $e) {
        return false;
    }
}

var_dump(isDate('2017-01-06')); // true
var_dump(isDate('2017-13-06')); // false
var_dump(isDate('2017-02-06T04:20:33')); // true
var_dump(isDate('2017/02/06')); // true
var_dump(isDate('3.6. 2017')); // true
var_dump(isDate(null)); // false
var_dump(isDate(true)); // false
var_dump(isDate(false)); // false
var_dump(isDate('')); // false
var_dump(isDate(45)); // false

JavaScript : Date validation, Javascript date validation: Javascript function to check a date in of the string supplied by user (i.e. dd, mm and yyyy) and check whether dd is� The ISDATE program determines whether a text expression represents a valid date. ISDATE only tests a text expression to see if it can be converted to a DATE-only value; it does not actually make the conversion. You must use CONVERT to make the conversion. Return Value. BOOLEAN. YES when the text expression represents a valid date; NO when it does not. Syntax

Easiest way to check if a string is a date:

if(strtotime($date_string)){
    // it's in date format
}

JavaScript: Check whether an input is a date object or not , Write a JavaScript function to check whether an 'input' is a date object or not. Test Data: console.log(is_date("October 13, 2014 11:13:00")); This will work on any browser since it does not rely on "Invalid Date" check. This will work with legacy code before ES6. This will work without any library. This will work regardless of any date format. This does not rely on Date.parse which fails the purpose when values like "Spiderman 22" are in date string. This does not ask us to write any

How to check a date is valid or not using JavaScript ?, If the date is Invalid then the getTime() will return NaN which is not equal to itself. The isValid() function is used to check the getTime() method is� Makedate () function can handle whether or not the proposed date is actually a valid date. If not valid, it returns null. For example like this: LOAD *, makedate(mid(possible_date,1,4),mid(possible_date,5,2),mid(possible_date,7,2)) as isDate. inline [. possible_date. 20150226.

How do I check if a string is a valid date?, The following code can be use to validate if a string contains a valid date information. The pattern of the date is defined by the java.text. Date data type supports only either 2 digits or 4 digits’ year. So instead you use select Convert (date, ’08/16/13′) or select Convert (date, ’08/16/2013′). Date data type supports only either 2 digit or 4 digit year string literals whereas for datetime data type there is no restriction like date type.

Java Date Validation Example, In this example, we are checking whether a given date is valid or not. In the method validateJavaDate(String) we have specified the date format as “MM/dd/ yyyy”� For our goal in this article, let's take a look at the GenericValidator class, which provides a couple of methods to check if a String contains a valid date: public static boolean isDate(String value, Locale locale) public static boolean isDate(String value,String datePattern, boolean strict)

How to check if a value is a date - Build, TryParse Method (System). Converts the specified string representation of a date and time to its equivalent and returns a value that indicates whether the� The expression is a character string or expression that can resolve to a character string. Its length must be less than 4,000 characters. The expression can be also a value of DATE or TIME, but it cannot be a value of DATETIME or SMALLDATETIME type. If the expression is a DATETIME2 value, the function returns 0.

Comments
  • Possible duplicate: stackoverflow.com/questions/37732/…
  • This is not a solution. I have DateTime::createFromFormat('m/d/Y', '10/38/2013') and that produces a valid DateTime object and not false. The date is converted to object(DateTime)#39 (3) { ["date"]=> string(19) "2013-11-07 23:45:55" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
  • Yikes. I love how these things are never pointed out in the documentation ... You don't happen to have found an alternative? (Edit: Date formats documents that you can over-/underflow months and days, but doesn't give a hint what to do when you don't want that behaviour.
  • Okay well there's no solution or setting to override this in PHP. I noted a workaround in the answers stackoverflow.com/a/19666600/486863
  • This solution indeed is not working ok for dates like the one specified by cj5 . Which can be very frustrating. I used as well this solution stackoverflow.com/questions/10120643/…
  • It's my format Tue Oct 30 05:51:41 GMT+05:30 2018 how can we check it?, is there any common way of doing?
  • var_dump(isDate('now')); //true var_dump(isDate('tomorrow')); //true var_dump(isDate('yesterday')); //true
  • Beware integers! isDate('123456') == true and isDate(123456) == true
  • var_dump(isDate("R")) = true. probably not what's intended. I think it matches a time zone or something.
  • this is great if you know what you're passing into it. In my case I do
  • I can't see why this would not be the accepted answer. Here is the PHP manual that specifically says this will return FALSE if anything but a date string: php.net/manual/en/function.strtotime.php
  • This is the best, elegant, simple and effective method I've seen so far. Thank You Yogesh Mistry
  • ^(\d{4}(?:\-\d{2}){2} \d{2}(?:\:\d{2}){2})$