Type for Current Time Function

[Ben Rudiak-Gould]

Ashley Yakeley wrote:

 >The most basic or at least the most obvious function in a time library
 >is one that gets the current time. What is its return type?
 >
 >  getCurrentTime :: IO ???

The only way to find out the current time is to ask the system for it, 
so, following the rule of avoid-unnecessary-conversions, I think it 
boils down to what the system provides.

My impression is that it doesn't reliably provide us anything. Therefore 
we should omit getCurrentTime from the library. :-)

Or, more pragmatically, have it return OSTime, and provide 
broken-by-design conversions from that to everything else. OSTime would 
presumably be struct timeval on Unix, and FILETIME or SYSTEMTIME on Win32.

-- Ben