[Haskell-cafe] ISO 8601 Date time format without old-locale?

[Bram Neijt]

I want to do ISO8601 formatting of a date with a numeric zone offset
and I can't seem to find a way of doing it without requiring the
old-locale package[1].

What is the current method of obtaining and formatting time
representation if old-locale is old?

Greetings,

Bram

[1] A sketch of the code using old-locale:
-- 2014-11-18T06:37:04+00:00
iso8601DateTimeFormat :: String
iso8601DateTimeFormat = "%FT%T%z"

main = do
  now <- getCurrentTime
  putStrLn $ formatTime defaultTimeLocale iso8601DateTimeFormat now

Which requires "defaultTimeLocale" from the old-locale package.