I am looking for a function to convert date in one timezone to another.
It need two parameters,
You can also use https://www.npmjs.com/package/ctoc_timezone
It has got much simple implementation and format customisation.
Changing format in toTimeZone:
CtoC.toTimeZone(new Date(),"EST","Do MMM YYYY hh:mm:ss #{EST}");
Output :
28th Feb 2013 19:00:00 EST
You can explore multiple functionalities in the doc.