herf-time: haskell time manipulation in a 'kerf like' style.
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The herf-time package attempts to make the time package's syntax more straightforward for doing interval math and conversion. It borrows heavily from the syntax of the kerf programming language https://github.com/kevinlawler/kerf . But unlike kerf, there are no promisses of high performance code here. The performance seems adequate for lots of uses though and manipulating time in the herf library is pretty fun.
The KerfTime module is self contained and the only dependency is the time package.
Add intervals of varying amounts.
date 2016 01 01 `add` hour 3 `add` week 16 `add` month 3 :: UTCHerfTime
UTCHerfTime 2016-07-22 03:00:00 UTC
Subtract intervals as well
date 2016 01 01 `add` hour (-3) `add` week (-16) `add` month (-3) :: UTCHerfTime
UTCHerfTime 2015-06-10 21:00:00 UTC
Use the same interval notation for different time representation
dateTime 2016 01 01 01 23 01 `add` (hour 3) `add` (week 16) `add` (month 3) :: UTCHerfTime
UTCHerfTime 2016-07-22 04:23:01 UTC
(reherf $ ( dateTime 2016 01 01 01 01 01 :: HerfZonedTime "CST")) :: HerfZonedTime "PST"
2015-12-31T23:01:01:PST
zt <- getZonedTime
herfShow zt
"2016-01-21T11:29:05:CST"
reherfz zt :: HerfZonedTime "PST"
2016-01-21T09:29:05:PST
reherfz zt :: HerfZonedTime "+0600"
2016-01-21T23:29:05:+0600
reherfz zt :: HerfZonedTime "CST"
2016-01-21T11:29:05:CST
(reherfz zt) `add` month 2 :: HerfZonedTime "CST"
2016-03-21T11:29:05:CST
(reherfz zt) `add` month 2 :: HerfZonedTime "PST"
2016-03-21T09:29:05:PST
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Properties
| Versions | 0.1.0, 0.2.0, 0.2.2, 0.3.0, 0.3.0, 0.3.1 |
|---|---|
| Change log | ChangeLog.md |
| Dependencies | base (>=4 && <5), time [details] |
| License | BSD-3-Clause |
| Author | Scott Murphy <scottmurphy09@gmail.com> |
| Maintainer | Scott Murphy <scottmurphy09@gmail.com> |
| Category | Time, Kerf |
| Source repo | head: git clone https://github.com/smurphy8/herf-time |
| Uploaded | by scottmurphy09 at 2018-12-19T23:21:36Z |
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Downloads
- herf-time-0.3.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
Package maintainers
For package maintainers and hackage trustees
Readme for herf-time-0.3.0
[back to package description]herf-time
Haskell's time library is nice but I wanted to be able to do some of the operations in the Kerf programming language.
By creating a set of type classes: HerfedTime , ToUTCHerfTime, FromUTCHerfTime I think there is a nice mechanism to do just that.
any instance of these 3 classes should satisfy the law:
- Path Independant on all addtion
addX a X == unherf (addX (herf a) X )- where:
addX := {addYear , addMonth, addWeek ...}
- where:
Tutorial
Usage
Add Intervals
>>> date 2016 01 01 `add` hour 3 `add` week 16 `add` month 3 :: UTCTime
UTCHerfTime 2016-07-22 03:00:00 UTC
Subtract Intervals
>>> date 2016 01 01 `add` hour (-3) `add` week (-16) `add` month (-3) :: UTCTime
UTCHerfTime 2015-06-10 21:00:00 UTC
Represent Time in Multiple Ways
>>> dateTime 2016 01 01 01 23 01 `add` hour 3 `add` week 16 `add` month 3 :: UTCTime
UTCHerfTime 2016-07-22 04:23:01 UTC
>>> dateTimePico 2016 01 01 01 23 01 01 `add` hour 3 `add` week 16 `add` month 3 :: UTCTime
UTCHerfTime 2016-07-22 04:23:01.000000000001 UTC
Get Times in any HerfedTime format (UTC for example)
>>> date 2016 01 01 `add` hour 3 `add` week 16 `add` month 3 :: UTCTime
2016-07-22 03:00:00 UTC
Use HerfTime.ZonedTime to convert easily between times
(reherf $ ( dateTime 2016 01 01 01 01 01 :: HerfZonedTime "CST")) :: HerfZonedTime "PST" 2015-12-31T23:01:01:PST
Some fancier examples (Using HerfTime.ZonedTime)
λ> zt <- getZonedTime
λ> herfShow zt
"2016-01-21T11:29:05:CST"
λ> reherfz zt :: HerfZonedTime "PST"
2016-01-21T09:29:05:PST
λ> reherfz zt :: HerfZonedTime "+0600"
2016-01-21T23:29:05:+0600
λ> reherfz zt :: HerfZonedTime "CST"
2016-01-21T11:29:05:CST
λ> (reherfz zt) `add` month 2 :: HerfZonedTime "CST"
2016-03-21T11:29:05:CST
-- What time will it be exactly 3 months from now in California?
λ> (reherfz zt) `add` month 2 :: HerfZonedTime "PST"
2016-03-21T09:29:05:PST
cabal configure --enable-tests && cabal build && cabal test