How do I validate a date in this format yyyy-mm-dd using jquery

Question

I am attempting to validate a date in this format   yyyy-mm-dd    I found this solution but it is in the wrong format for what I need  as in   mm dd yyyy    Here is the link to that solution  http   jsfiddle net ravi1989 EywSP 848   My code is below   function isDate txtDate        var currVal   txtDate      if currVal                return false       var rxDatePattern       d 1 2      -   d 1 2      -   d 4        Declare Regex     var dtArray   currVal match rxDatePattern      is format OK       if  dtArray    null           return false         Checks for mm dd yyyy format      dtMonth   dtArray 1       dtDay  dtArray 3       dtYear   dtArray 5                if  dtMonth  lt  1    dtMonth  gt  12           return false      else if  dtDay  lt  1    dtDay gt  31           return false      else if   dtMonth  4    dtMonth  6    dtMonth  9    dtMonth  11   amp  amp  dtDay   31           return false      else if  dtMonth    2                 var isleap    dtYear   4    0  amp  amp   dtYear   100    0    dtYear   400    0            if  dtDay gt  29     dtDay   29  amp  amp   isleap                    return false            return true      What regex pattern can I use for this that will account for invalid dates and leap years

User · Answer

I expanded just slightly on the isValidDate function Thorbin posted above (using a regex). We use a regex to check the format (to prevent us from getting another format which would be valid for Date). After this loose check we then actually run it through the Date constructor and return true or false if it is valid within this format. If it is not a valid date we will get false from this function.

_x000D_

function isValidDate(dateString) {_x000D_
  var regEx = /^\d{4}-\d{2}-\d{2}$/;_x000D_
  if(!dateString.match(regEx)) return false;  // Invalid format_x000D_
  var d = new Date(dateString);_x000D_
  var dNum = d.getTime();_x000D_
  if(!dNum && dNum !== 0) return false; // NaN value, Invalid date_x000D_
  return d.toISOString().slice(0,10) === dateString;_x000D_
}_x000D_
_x000D_
_x000D_
/* Example Uses */_x000D_
console.log(isValidDate("0000-00-00"));  // false_x000D_
console.log(isValidDate("2015-01-40"));  // false_x000D_
console.log(isValidDate("2016-11-25"));  // true_x000D_
console.log(isValidDate("1970-01-01"));  // true = epoch_x000D_
console.log(isValidDate("2016-02-29"));  // true = leap day_x000D_
console.log(isValidDate("2013-02-29"));  // false = not leap day

_x000D_

User · Answer

try this Here is working Demo     function             btnSubmit   bind  click   function            var txtVal        txtDate   val            if isDate txtVal               alert  Valid Date            else             alert  Invalid Date             function isDate txtDate        var currVal   txtDate      if currVal                return false       var rxDatePattern       d 4      -   d 1 2      -   d 1 2        Declare Regex     var dtArray   currVal match rxDatePattern      is format OK       if  dtArray    null           return false         Checks for mm dd yyyy format      dtMonth   dtArray 3       dtDay  dtArray 5       dtYear   dtArray 1                if  dtMonth  lt  1    dtMonth  gt  12           return false      else if  dtDay  lt  1    dtDay gt  31           return false      else if   dtMonth  4    dtMonth  6    dtMonth  9    dtMonth  11   amp  amp  dtDay   31           return false      else if  dtMonth    2                 var isleap    dtYear   4    0  amp  amp   dtYear   100    0    dtYear   400    0            if  dtDay gt  29     dtDay   29  amp  amp   isleap                    return false            return true           changed regex is   var rxDatePattern       d 4      -   d 1 2      -   d 1 2        Declare Regex

User · Answer

Working Demo fiddle  here Demo  Changed your validation  function to this  function isDate txtDate    return txtDate match   d d    d d    d d d d

User · Answer

moment dateString   YYYY-MM-DD   true  isValid       moment dateString   YYYY-M-DD   true  isValid       moment dateString   YYYY-MM-D   true  isValid

User · Answer

Rearrange the regex to       d 4      -    d 1 2   2  d 1 2       I have done a little more than just rearrange the terms  I ve also made it so that it won t accept  broken  dates like yyyy-mm dd   After that  you need to adjust your dtMonth etc  variables like so   dtYear   dtArray 1   dtMonth   dtArray 3   dtDay   dtArray 4     After that  the code should work just fine

User · Answer

Here s the JavaScript rejex for YYYY-MM-DD format     12  d 3 - 0 1-9  1 0-2  - 0 1-9   12  d 3 01

User · Answer

You could also just use regular expressions to accomplish a slightly simpler job if this is enough for you  e g  as seen in  1     They are build in into javascript so you can use them without any libraries    function isValidDate dateString      var regEx      d 4 - d 2 - d 2       return dateString match regEx     null      would be a function to check if the given string is four numbers - two numbers - two numbers  almost yyyy-mm-dd   But you can do even more with more complex expressions  e g  check  2    isValidDate  23-03-2012      false isValidDate  1987-12-24      true isValidDate  22-03-1981      false isValidDate  0000-00-00      true     1  Javascript - Regex to validate date format  2  http   www regular-expressions info dates html

User · Answer

Since jQuery is tagged  here s an easy   user-friendly way to validate a field that must be a date  you will need the jQuery validation plugin    html   lt form id  frm  gt   lt input id  date creation  name  date creation  type  text    gt   lt  form gt    jQuery      frm   validate     rules        date creation          required  true        date  true                 DEMO   Example    UPDATE  After some digging  I found no evidence of a ready-to-go parameter to set a specific date format   However  you can plug in the regex of your choice in a custom rule       validator addMethod       myDateFormat       function value  element               yyyy-mm-dd         var re      d 4 - d 1 2 - d 1 2                 valid if optional and empty OR if it passes the regex test         return  this optional element   amp  amp  value         re test value                 frm   validate     rules        date creation             not optional       required  true           valid date       date  true                 This new rule would imply an update on your markup    lt input id  date creation  name  date creation  type  text  class  myDateFormat    gt

User · Answer

I recommend to use the  Using jquery validation plugin and jquery ui date picker  jQuery validator addMethod  customDateValidator   function value  element       dd-mm-yyyy    var re       0   1-9   1 2  0-9   3  0 1     -   0   1-9   1  0-2     -   0-9  4   0-9  2           if    re test value    return false       parseDate throws exception if the value is invalid    try jQuery datepicker parseDate   dd-mm-yy   value  return true       catch e  return false              Please enter a valid date format dd-mm-yyyy      this ui form validate       debug  true      rules         title     required   true  minlength  4         date     required  true  customDateValidator  true                Using Jquery and date picker just create a function with     dd-mm-yyyy var re       0   1-9   1 2  0-9   3  0 1     -   0   1-9   1  0-2     -   0-9  4   0-9  2         if    re test value    return false    parseDate throws exception if the value is invalid try jQuery datepicker parseDate   dd-mm-yy   value  return true    catch e  return false     You might use only the regular expression for validation      dd-mm-yyyy var re       0   1-9   1 2  0-9   3  0 1     -   0   1-9   1  0-2     -   0-9  4   0-9  2        return re test value     Of course the date format should be of your region

User · Answer

Just use Date constructor to compare with string input    x000D   x000D  function isDate str    x000D    return  string      typeof str  amp  amp   dt   new Date str    amp  amp   isNaN dt   amp  amp  str     dt toISOString   substr 0  10   x000D    x000D   x000D  console log isDate  2018-08-09     x000D  console log isDate  2008-23-03     x000D  console log isDate  0000-00-00     x000D  console log isDate  2002-02-29     x000D  console log isDate  2004-02-29     x000D   x000D   x000D    Edited  Responding to one of the comments     Hi  it does not work on IE8 do you have a solution for     Mehdi Jalal    x000D   x000D  function pad n    x000D    return  10  gt  n     0    n     n    x000D    x000D   x000D  function isDate str    x000D    if   string      typeof str       d 4  - d 2  - d 2   test str     x000D      return false  x000D      x000D    var dt   new Date str replace   - g         x000D    return dt  amp  amp   isNaN dt   amp  amp  0     str localeCompare  dt getFullYear    pad 1   dt getMonth     pad dt getDate     join  -     x000D    x000D   x000D  console log isDate  2018-08-09     x000D  console log isDate  2008-23-03     x000D  console log isDate  0000-00-00     x000D  console log isDate  2002-02-29     x000D  console log isDate  2004-02-29     x000D   x000D   x000D

User · Answer

You can use this one it s for YYYY-MM-DD  It checks if it s a valid date and that the value is not NULL  It returns TRUE if everythings check out to be correct or FALSE if anything is invalid  It doesn t get easier then this   function validateDate date        var matches       d 4   -     d 2   -     d 2     exec date       if  matches    null  return false      var d   matches 3       var m   matches 2  - 1      var y   matches 1        var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp              composedDate getMonth      m  amp  amp              composedDate getFullYear      y      Be aware that months need to be subtracted like this  var m   matches 2  - 1  else the new Date   instance won t be properly made

[javascript] How do I validate a date in this format (yyyy-mm-dd) using jquery?

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