CORE_DATE_TIMEZONE_CONVERT CORE Endpoint
  /rpc/core/?method=CORE_DATE_TIMEZONE_CONVERT  
  Convert a time from one time zone to another  
  PARAMETERS TYPE NOTES
  FromDate Date Mandatory. Date you want to convert
  FromTimeZone Numeric Mandatory. Time Zone as per SETUP_TIMEZONE_SEARCH
  ToTimeZone Numeric Optional. Defaults to the logged on user's Time Zone
  RETURN  
  ConvertedDate Date