Yes, I totally agree. The current time library is pretty broken.
-- Lennart
John Meacham wrote:
yes! I was just wrestling with this yesterday. I finally gave up and
looked inside ghc's (TOD Integer Integer) directly because the Time
library as it currently stands is somewhat less than useful. This is
probably a pretty serious bug in Haskell 98 as there is no good way to
work with times other than roll your own.
how about:
toRawTime :: ClockTime -> (Integer,Integer)
where they are # of seconds and picoseconds since epoch.
(and an 'epoch' constant ClockTime)
another useful thing would be
endOfTime and beginningOfTime constants, representing the minimum and
maximum values representable by ClockTime.
John
On Thu, Nov 14, 2002 at 10:22:46AM -0800, Christopher Milton wrote:
Hmm, this has come up before:
http://www.haskell.org/pipermail/glasgow-haskell-bugs/2001-September/001810.html
http://www.haskell.org/pipermail/haskell/2002-January/008678.html
--- Peter Thiemann <[EMAIL PROTECTED]> wrote:
Did anyone try to use the standard Time library that comes with Haskell
for a serious purpose?
I wanted to, but came across the problem that the TimeDiff data type is
underspecified. For example, what is the official way to convert a
TimeDiff value into seconds? The problematic parts are:
* how many days for one tdYear (365, 366)
* how many days for one tdMonth (28,29,30,31)
* how many seconds for one tdMin (given the presence of leap seconds)^(1)
Actually, once the absolute reference of the TimeDiff is lost, then it
is impossible to recover leap years and leap seconds, so TimeDiff
better had to account for them somehow. I suppose, the best would be
to just have diffClockTimes return the number of seconds as an Integer.
Since Simon PJ has finished editing the library report, who's now in
charge of keeping track of problems with it and perhaps writing a
commentary in cases such as this?
Cheers
-Peter
(1) for this one, there is reasonable consensus. for example the ISO
8601 standard (representation of dates and times) defines minute=60
seconds, hour=60 minutes, day=24 hours. However, this leads to the
strange(?) situation that the difference between
1998-12-31T12:00:00 and 1999-01-01T12:00:00
is 1 day and one second. (There was a leap second on that night
1998 December 31 23h 59m 59s
1998 December 31 23h 59m 60s
1999 January 01 0h 0m 0s
see http://tycho.usno.navy.mil/leap.html)
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