Difference between Date dateString and new Date dateString

Question

I have some code that tries to parse a date string    When I do alert Date  2010-08-17 12 09 36     It properly parses the date and everything works fine but I can t call the methods associated with Date  like getMonth     When I try   var temp   new Date  2010-08-17 12 09 36    alert temp     I get an  invalid date  error   Any ideas on how to parse  2010-08-17 12 09 36  with new Date

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I know this is old but by far the easier solution is to just use  var temp   new Date  2010-08-17T12 09 36

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Date    With this you call a function called Date    It doesn t accept any arguments and returns a string representing the current date and time   new Date    With this you re creating a new instance of Date   You can use only the following constructors   new Date      current date and time new Date milliseconds    milliseconds since 1970 01 01 new Date dateString  new Date year  month  day  hours  minutes  seconds  milliseconds    So  use 2010-08-17 12 09 36 as parameter to constructor is not allowed   See w3schools     EDIT  new Date dateString  uses one of these formats     October 13  1975 11 13 00   October 13  1975 11 13   October 13  1975

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I recently ran into this as well and this was a helpful post   I took the above Topera a step further and this works for me in both chrome and firefox   var temp   new Date   Date  2010-08-17 12 09 36        alert temp     the internal call to Date   returns a string that  new Date   can parse

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I was having the same issue using an API call which responded in ISO 8601 format   Working in Chrome this worked         date variable from an api all in ISO 8601 format yyyy-mm-dd hh mm ss   var date   oDate  events    event   0   start time      var eventDate   new Date      var outputDate   eventDate toDateString         but this didn t work with firefox   Above answer helped me format it correctly for firefox       date variable from an api all in ISO 8601 format yyyy-mm-dd hh mm ss  var date   oDate  events    event   0   start time     var eventDate   new Date date replace  - g        var outputDate   eventDate toDateString

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Correct ways to use Date   https   developer mozilla org en JavaScript Reference Global Objects Date  Also  the following piece of code shows how  with a single definition of the function  Animal   it can be a  called directly and b  instantiated by treating it as a constructor function  function Animal        this abc   1      return 1234      var x   new Animal    var y   Animal     console log x     prints object containing property abc set to value 1 console log y      prints 1234

User · Answer

You re not getting an  invalid date  error  Rather  the value of temp is  Invalid Date    Is your date string in a valid format  If you re using Firefox  check Date parse  In Firefox javascript console    gt  gt  gt  Date parse  2010-08-17 12 09 36    NaN  gt  gt  gt  Date parse  Aug 9  1995   807944400000   I would try a different date string format   Zebi  are you using Internet Explorer

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The following format works in all browsers   new Date  2010 08 17 12 09 36      So  to make a yyyy-mm-dd hh mm ss formatted date string fully browser compatible you would have to replace dashes with slashes   var dateString    2010-08-17 12 09 36   new Date dateString replace  - g

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The difference is the fact  if I recall from the ECMA documentation  is that Date  xx   does not create  in a sense  a new date object  in fact it is equivalent to calling  new Date  xx   toString     While new Date  xx   will actually create a new date object   For More Information   Look at 15 9 2 of http   www ecma-international org publications files ECMA-ST ECMA-262 pdf

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Any ideas on how to parse  2010-08-17 12 09 36  with new Date      Until ES5  there was no string format that browsers were required to support  though there are a number that are widely supported  However browser support is unreliable an inconsistent  e g  some will allow out of bounds values and others wont  some support certain formats and others don t  etc    ES5 introduced support for some ISO 8601 formats  however the OP is not compliant with ISO 8601 and not all browsers in use support it anyway   The only reliable way is to use a small parsing function  The following parses the format in the OP and also validates the values    x000D   x000D     Parse date string in format yyyy-mm-dd hh mm ss x000D     If string contains out of bounds values  an invalid date is returned x000D      x000D      param  string  s - string to parse  e g   2010-08-17 12 09 36  x000D                         treated as  local  date and time x000D      returns  Date    - Date instance created from parsed string x000D     x000D  function parseDateString s    x000D    var b   s split   D    x000D    var d   new Date b 0   --b 1   b 2   b 3   b 4   b 5    x000D    return d  amp  amp  d getMonth      b 1   amp  amp  d getHours      b 3   amp  amp  x000D           d getMinutes      b 4   d   new Date NaN   x000D    x000D     x000D  document write  x000D    parseDateString  2010-08-17 12 09 36       lt br gt         Valid values x000D    parseDateString  2010-08-45 12 09 36                  Out of bounds date x000D     x000D   x000D   x000D

[javascript] Difference between Date(dateString) and new Date(dateString)

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