bugs in Time.hs

Härmel Nestra nestra@math.ut.ee
Tue, 26 Aug 2003 17:53:32 +0200 (EET) 

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Hi Hugs-team,

I found several divergences of the module  Time  of Hugs (v. Nov 
2002 for Linux) from the Haskell Report which can't be found neither
in the list of known Hugs bugs nor in the list of differences from 
Haskell 98 (the latter is also too old and claims that  Time  is not 
yet available).

1. The report specifies that the field  ctSec  of datatype 
CalendarTime  must be exported outside the module. In Hugs, this field 
is missing from the exports list.

2. The report requires (see the end of the penultimate paragraph 
before the library starts) that " toClockTime l  converts  l  [...] 
ignoring the contents of the  ctWDay ,  ctYDay ,  ctTZName ,  and  
ctIsDST  fields". Hugs, however, does not ignore  ctIsDST .

3. Additionally, the behaviour of the function  diffClockTime  is 
strange in Hugs. In the returned record, at most two fields are 
non-zero:  tdSec  and  tdPicosec . Thereby,  tdSec  is of type  Int  
which leads to incorrect value in the case of big time differences. 
The report is amazingly tongue-tied at this point, so it is even 
difficult to argue that your implementation is diverging. It seems 
natural to think however that this behaviour is not what was expected. 
I solved this problem by changing the type of  tdSec  to be  Integer . 
But this created a new divergence from the report.

4. There seem to be problems with dates before year 1970.

I attach my version of  Time.hs  to this mail, perhaps it helps you 
somewhat (the places of change are documented with today's date).
(Handling dates before 1970 has not been added there.)

The report on  Time  is really funny. It specifies that 
"Pre-Gregorian dates are inaccurate". So if your implementation 
handles pre-Gregorian dates accurately then it does not implement the 
Haskell 98 language correctly :)

Best regards,
Härmel Nestra
(researcher of University of Tartu, Estonia)

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