The lens-datetime package

[Tags: bsd3, library]

The lens-datetime library provides a unified lens based accessors to the various types in Data.Time.Clock, Data.Time.Calendar and Data.Time.LocalTime. This library only tries to make some of the common use-cases convenient, it doesn't aim for completeness. If you want completeness and/or efficiency try the thyme package instead (http://hackage.haskell.org/package/thyme).

Demonstration of basic uses.

import Control.Lens
import Data.Time
import Data.Time.Lens

aDay :: Day
aDay = fromGregorian 2013 08 22

aLocal :: LocalTime
aLocal = LocalTime aDay (TimeOfDay 13 45 28)

aUTC :: UTCTime
aUTC = UTCTime aDay 7458.9

You can then do the following:

> aLocal ^. years
2013
> aUTC ^. months
8
> aLocal & time .~ midnight
2013-08-22 00:00:00
> aUTC & days .~ 1 & months .~ 1
2013-01-01 02:04:18.9 UTC

You can manipulate the date-time values with proper roll-over behavior via the FlexibleDateTime mechanism:

> aLocal & flexDT.months +~ 12
2014-08-22 13:45:28
> aUTC & flexDT.days +~ 100
2013-11-30 02:04:18.9 UTC
> aLocal & flexDT.minutes +~ 120
2013-08-22 15:45:28
> aLocal & flexDT %~ ((days +~ 7) . (hours +~ 2))
2013-08-22 13:45:28

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Properties

Versions0.1, 0.1.1, 0.2, 0.2.1
Change logNone available
Dependenciesbase (>=4.6 && <5), lens (>=3 && <5), time (==1.*) [details]
LicenseBSD3
AuthorMihaly Barasz <klao@nilcons.com>
MaintainerMihaly Barasz <klao@nilcons.com>
Stabilityexperimental
CategoryData, Lenses
Home pagehttp://github.com/nilcons/lens-datetime
Bug trackerhttp://github.com/nilcons/lens-datetime/issues
Source repositoryhead: git clone https://github.com/nilcons/lens-datetime.git
UploadedWed Apr 2 10:09:05 UTC 2014 by MihalyBarasz
DistributionsNixOS:0.2.1
Downloads764 total (28 in last 30 days)
Votes
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StatusDocs available [build log]
Successful builds reported [all 1 reports]

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Readme for lens-datetime-0.2.1

lens-datetime

Haskell library that provides a unified lens based accessors to the various types in Data.Time.Clock and Data.Time.LocalTime.