add instances for UTCTime

[knupfer]

Time series are very frequent in statistics and therfore frequent in csv.

[rampion]

+1

I also found myself wanting to parse timestamp fields.

Perhaps a nice workaround might be to give a way to lift general attoparsec Parsers into Cassava parsers; then I could just reuse the timestamp parsers from something like timeparsers when parsing my timestamps rather than relying on Cassava to have them or reimplementing them myself.

[ivan-m]

Is this related to #68?

[ocramz]

I just ran into this as well. @hvr would you accept to import time and/or timeparsers and provide FromField/ToField instances of Day etc. ?

[ocramz]

There's a PR for this already: https://github.com/haskell-hvr/cassava/pull/151