Javascript getFullyear is not a function

Question

I am getting an error   Statdate getFullyear   is not a function    From this javascript code   var start   new Date    start   document getElementById  Stardate   value    var y   start getFullYear      Any idea why that function isn t available

User · Accepted Answer

Try this      var start   new Date document getElementById  Stardate   value    var y   start getFullYear

User · Answer

You are overwriting the start date object with the value of a DOM Element with an id of Startdate   This should work   var start   new Date document getElementById  Stardate   value    var y   start getFullYear

User · Answer

One way to get this error is to forget to use the  new  keyword when instantiating your Date in javascript like this    gt  d   Date     Tue Mar 15 2016 20 05 53 GMT-0400  EDT    gt  typeof d    string   gt  d getFullYear    TypeError  undefined is not a function   Had you used the  new  keyword  it would have looked like this    gt  el defiant   node  gt  d   new Date    Tue Mar 15 2016 20 08 58 GMT-0400  EDT   gt  typeof d    object   gt  d getFullYear 0   2016   Another way to get that error is to accidentally re-instantiate a variable in javascript between when you set it and when you use it  like this   el defiant   node  gt  d   new Date    Tue Mar 15 2016 20 12 13 GMT-0400  EDT   gt  d getFullYear    2016  gt  d   57   23  80  gt  d getFullYear    TypeError  undefined is not a function

[javascript] Javascript: getFullyear() is not a function

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