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Today's Topics:
1. Simple data type for dates? (Galaxy Being)
2. Re: Simple data type for dates? (Matthew Low)
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Message: 1
Date: Tue, 29 Jun 2021 23:57:41 -0500
From: Galaxy Being <borg...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: [Haskell-beginners] Simple data type for dates?
Message-ID:
<cafahfsupuzxidjrqz7ajdt-eokjptjfkloqyx9falc7ja6o...@mail.gmail.com>
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I've looked at Data.Time, but I'm not seeing examples. I'd like to figure
out how to simply have use of similar to this:
type MyMonth = String
type MyDay = String
type MyYear = String
data MyDate = MyDate MyMonth MyDay MyYear deriving Show
storeDate :: MyDate
storeDate = "June" "29" "2021"
which will be in a bigger data structure I'm building. I can't believe this
isn't reinventing some long-established wheel. Is there such a type ready
to use?
⨽
Lawrence Bottorff
Grand Marais, MN, USA
borg...@gmail.com
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Message: 2
Date: Tue, 29 Jun 2021 23:31:47 -0600
From: Matthew Low <m...@ualberta.ca>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Simple data type for dates?
Message-ID:
<CAC=gtkzaabfyenh561ozwni8t7ftrrrsoaz5xcv-iqvtdlz...@mail.gmail.com>
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The `time` package equivalent of `MyDate` would be `Day`:
storeDate :: Day
storeDate = fromGregorian 2021 6 29
> storeDate
2021-06-29
> toGregorian storeDate
(2021,6,29)
> dayOfWeek storeDate
Tuesday
However, I don't see any easy conversion between the numeric month and its
English name.
On Tue, Jun 29, 2021 at 10:58 PM Galaxy Being <borg...@gmail.com> wrote:
> I've looked at Data.Time, but I'm not seeing examples. I'd like to figure
> out how to simply have use of similar to this:
>
> type MyMonth = String
> type MyDay = String
> type MyYear = String
> data MyDate = MyDate MyMonth MyDay MyYear deriving Show
>
> storeDate :: MyDate
> storeDate = "June" "29" "2021"
>
> which will be in a bigger data structure I'm building. I can't believe
> this isn't reinventing some long-established wheel. Is there such a type
> ready to use?
>
> ⨽
> Lawrence Bottorff
> Grand Marais, MN, USA
> borg...@gmail.com
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
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