Thanks Ertugrul and Yitzchak. I failed to notice the Real and Fractional instances for DiffTime. Thanks very much for pointing me to it. I dropped the dependency on datetime and implemented your suggestions.
Bas On 21 January 2012 22:29, Yitzchak Gale <g...@sefer.org> wrote: > Bas van Dijk wrote: >> What's the recommended way for serializing (with the cereal package) an >> UTCTime? > > Serialize the Day part as an Integer using > toModifiedJulianDay/ModifiedJulianDay, > (Note that Day is not a constructor, it's just the name of > the type.) > > Serialize the DiffTime as a Rational, as Ertugrul said. > >> I'm now using the datetime package > > Why? It just obscures the time library. > >> But I will have to look at the code of datetime to see if I'm not >> losing precision. > > You are losing precision. If you only care > about time to the nearest second, you can truncate > the Rational of the DiffTime (don't round, because > this may be the last second of a day) and then > use fromIntegral to deserialize. > > Regards, > Yitz _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
