How to convert IST to EST dates

This is the correct usage

function tes()
{
    var current = aqDateTime.Now();
    Log.Message(aqConvert.DateTimeToFormatStr(current, "%d %b %Y %I:%M:%S %p %z"));
}

and to perform the "conversion", see https://stackoverflow.com/questions/16805806/conversion-of-time-zone-from-est-to-ist-using-java-script and you should be able to perform the same.

What is %est ? As it's not defined in Date and Time Format Specifiers.