[Haskell-cafe] GHC 7.0.3 / Win32: Data.Time library?

[Dmitri O.Kondratiev]

Hi, Yitz!
Your example puts scattered around pieces in place, thanks a lot!

On Wed, Jun 15, 2011 at 9:49 AM, Yitzchak Gale <gale at sefer.org> wrote:

> Dmitri O.Kondratiev wrote:
> > It would also help to see a simple example of parsing "10/11/2009 7:04:28
> > PM" to  time and date objects.
>
> Let's assume that 10/11/2009 means October 11, as in the U.S.
> Then you can use:
>
> import System.Locale (defaultTimeLocale)
> import Data.Time
>
> thatMoment :: Maybe UTCTime
> thatMoment = parseTime defaultTimeLocale "%m/%d/%Y %l:%M:%S %p"
> "10/11/2009 7:04:28 PM"
>
> Then use diffUTCTime to subtract two UTCTime and
> get the amount of time between them. The resulting object
> can then be used as if it is a regular floating point number
> in units of seconds, or you can use the functions in Data.Time
> that treat it specially as an amount of time.
>
> There are many options for the format string and locale that will
> affect how the date is parsed - the order of month and day,
> leading zeros or leading spaces, upper case or lower case AM or PM
> (or 24-hour clock), etc. You can also get different behavior on
> parsing failure by using readTime or readsTime instead of parseTime.
>
> For details, see:
>
>
> http://www.haskell.org/ghc/docs/7.0.3/html/libraries/time-1.2.0.3/Data-Time-Format.html
>
> http://www.haskell.org/ghc/docs/7.0.3/html/libraries/old-locale-1.0.0.2/System-Locale.html#t:TimeLocale
>
> http://www.haskell.org/ghc/docs/7.0.3/html/libraries/old-locale-1.0.0.2/src/System-Locale.html#TimeLocale
>
> As an example of modifying the locale, let's say you want to use "a" and
> "p"
> instead of "AM" and "PM", as is customary in some parts of the world.
> Then you can say:
>
> myLocale = defaultTimeLocale {amPm = ("a","p")}
>
> and then use myLocale instead of defaultTimeLocale.
>
> Hope this helps,
> Yitz
>
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