Google Script Date Showing Wrong "hours"

I feel as if I have poured over nearly all of the documentation regarding dates in JS and GAS. Especially concerning DST issues. Since I have not had a problem like this until the

Solution 1:

what I usually use without any issue is simply that :

  var FUS1=new Date(dateObject).toString().substr(25,6)+":00";// get the timeZone part of the string coming from the date you are working on (an event)
  dateString = Utilities.formatDate(dateObject, FUS1, "MM/dd/yyyy HH:mm:ss");// use it in formatDate and it will have the right value for every season...

note that you were using date 2 times in your example code :once as a string result and once as a date object in the same line...

Edit following your comment :

assuming for example that the datestamp is in A2, the following code should return the right time.

  var date = SpreadsheetApp.getActiveSheet().getRange('A2').getValue();
  var FUS1=new Date(date).toString().substr(25,6)+":00";
  dateString = Utilities.formatDate(date, FUS1, "MM/dd/yyyy HH:mm:ss");