Type for Current Time Function

[Bayley, Alistair]

> From: Ashley Yakeley [mailto:ashley at semantic.org] 
> 
> 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 ???


It looks as though POSIX should be avoided, so I vote for (days, ticks). Is
there some reason it couldn't (shouldn't) be an opaque type? i.e. with
functions to convert to-and-from:
 - (days, ticks)
 - seconds since epoch
 - Calendar Time (in various calendars and timezones, etc)
 - other arbitrary representations

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