The recommended time functions have changed. Data.Time
etc. from the time
package is a complete and more logical rewrite of Haskell's time functions. To quote the top of
http://hackage.haskell.org/package/old-time-1.1.0.2/docs/System-Time.html:
The standard time library from Haskell 98. This library is deprecated, please look at Data.Time in the time package instead.