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Implement DateTimeBasicsLog (#192)
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‎README.md‎

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| | :heavy_check_mark: | [ComponentsHalogenHooks](recipes/ComponentsHalogenHooks) | Demonstrates how to nest one Halogen-Hooks-based component inside another and send/receive queries between the two. |
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| | :heavy_check_mark: | [ComponentsInputHalogenHooks](recipes/ComponentsInputHalogenHooks) | Each time a parent re-renders, it will pass a new input value into the child, and the child will update accordingly. |
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| | :heavy_check_mark: | [ComponentsMultiTypeHalogenHooks](recipes/ComponentsMultiTypeHalogenHooks) | Demonstrates a component that can communicate with its children that have differing types. |
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| :heavy_check_mark: | :heavy_check_mark: | [DateTimeBasicsLog](recipes/DateTimeBasicsLog) | This recipe shows how to use `purescript-datetime` library to create `Time`, `Date`, and `DateTime` values and adjust/diff them. |
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| :heavy_check_mark: | :heavy_check_mark: | [DebuggingLog](recipes/DebuggingLog) | This recipe shows how to do print-debugging using the `Debug` module's `spy` and `traceM` functions. The compiler will emit warnings to remind you to remove these debug functions before you ship production code. |
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| :heavy_check_mark: | | [DiceCLI](recipes/DiceCLI) | This recipe shows how to create an interactive command line prompt that repeatedly generates a random number between 1 and 6. |
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| :heavy_check_mark: | :heavy_check_mark: | [DiceLog](recipes/DiceLog) | This recipe shows how to log a random integer between 1 and 6 (representing a roll of a die) in either the node.js or web browser console. |

‎recipes/DateTimeBasicsLog/.gitignore‎

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/bower_components/
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/node_modules/
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/.pulp-cache/
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/output/
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/generated-docs/
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/.psc-package/
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/.psc*
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/.purs*
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/.psa*
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/.spago
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/web-dist/
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/prod-dist/
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/prod/

‎recipes/DateTimeBasicsLog/README.md‎

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# DateTimeBasicsLog
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This recipe shows how to use `purescript-datetime` library to create `Time`, `Date`, and `DateTime` values and adjust/diff them.
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## Expected Behavior:
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Prints the following to the console. For the browser environement, make sure to open the console with dev tools first, then reload/refresh the page:
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```
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To create a specific part of a `Time` value, you must use the `toEnum` function. This ensures that the value you provide is within the correct bounds.
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For example, a Minute must be between 0 and 59. If you happen to pass it -1, what should it's value be? Should it be clamped to 0? Or should it be set to 59? Rather than deciding for you, it forces you to do the checking by using `toEnum` to return a `Maybe Minute`.
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toEnum 4: (Just (Minute 4))
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toEnum -8: Nothing
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toEnum 69: Nothing
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The same goes for Hour (0 - 23), Second (0 - 59), and Millisecond (0 - 999).
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toEnum 4: (Just (Hour 4))
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toEnum -8: Nothing
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toEnum 69: Nothing
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To create a `Time` value, you use the `Maybe` monad and do notation:
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mkTime 4 24 4 3: (Just (Time (Hour 4) (Minute 24) (Second 4) (Millisecond 3)))
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mkTime 42 842 2 -42: Nothing
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To create a `Date` value, we use the `Maybe` monad again:
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mkCanonicalDate 2016 Feb 31: (Just (Date (Year 2016) March (Day 2)))
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mkExactDate 2016 Feb 31: Nothing
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mkExactDate 2016 Feb 27: (Just (Date (Year 2016) February (Day 27)))
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mkDateTime 2016 Feb 27 @ 11:04:14:423: (Just (DateTime (Date (Year 2016) February (Day 27)) (Time (Hour 11) (Minute 4) (Second 14) (Millisecond 423))))
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Original DateTime: (DateTime (Date (Year 2016) February (Day 27)) (Time (Hour 11) (Minute 4) (Second 14) (Millisecond 423)))
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Add five seconds: (Just (DateTime (Date (Year 2016) February (Day 27)) (Time (Hour 11) (Minute 4) (Second 19) (Millisecond 423))))
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Add two days: (Just (DateTime (Date (Year 2016) February (Day 29)) (Time (Hour 11) (Minute 4) (Second 14) (Millisecond 423))))
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Add four hours: (Just (DateTime (Date (Year 2016) February (Day 27)) (Time (Hour 15) (Minute 4) (Second 14) (Millisecond 423))))
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Number of Days between two dateTimes: (Days 1.0)
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```

‎recipes/DateTimeBasicsLog/nodeSupported.md‎

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This file just indicates that the node backend is supported.
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It is used for CI and autogeneration purposes.

‎recipes/DateTimeBasicsLog/spago.dhall‎

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{ name = "DateTimeBasicsLog"
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, dependencies = [ "console", "datetime", "effect", "maybe", "psci-support" ]
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, packages = ../../packages.dhall
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, sources = [ "recipes/DateTimeBasicsLog/src/**/*.purs" ]
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}

‎recipes/DateTimeBasicsLog/src/Main.purs‎

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module DateTimeBasicsLog.Main where
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import Prelude
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import Data.Date (Date, Month(..), canonicalDate, exactDate)
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import Data.DateTime (DateTime(..), adjust, diff)
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import Data.Enum (toEnum)
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import Data.Maybe (Maybe, fromJust)
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import Data.Time (Hour, Minute, Time(..))
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import Data.Time.Duration as D
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import Effect (Effect)
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import Effect.Console (log)
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import Partial.Unsafe (unsafePartial)
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main :: Effect Unit
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main = do
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log "To create a specific part of a `Time` value, you must use \
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\the `toEnum` function. This ensures that the value you provide \
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\is within the correct bounds. "
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log "For example, a Minute must be between 0 and 59. If you happen \
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\to pass it -1, what should it's value be? Should it be clamped to 0? \
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\Or should it be set to 59? Rather than deciding for you, it forces \
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\you to do the checking by using `toEnum` to return a `Maybe Minute`."
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log $ "toEnum 4: " <> show (toEnum 4 :: Maybe Minute)
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log $ "toEnum -8: " <> show (toEnum (-8) :: Maybe Minute)
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log $ "toEnum 69: " <> show (toEnum 69 :: Maybe Minute)
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log "The same goes for Hour (0 - 23), Second (0 - 59), and \
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\Millisecond (0 - 999)."
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log $ "toEnum 4: " <> show (toEnum 4 :: Maybe Hour)
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log $ "toEnum -8: " <> show (toEnum (-8) :: Maybe Hour)
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log $ "toEnum 69: " <> show (toEnum 69 :: Maybe Hour)
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log "To create a `Time` value, you use the `Maybe` monad and do notation:"
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let
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mkTime :: Int -> Int -> Int -> Int -> Maybe Time
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mkTime h m s ms = do
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Time <$> toEnum h
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<*> toEnum m
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<*> toEnum s
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<*> toEnum ms
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log $ "mkTime 4 24 4 3: " <> show (mkTime 4 24 4 3) -- valid
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log $ "mkTime 42 842 2 -42: " <> show (mkTime 42 842 2 (-42)) -- invalid
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log "To create a `Date` value, we use the `Maybe` monad again:"
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let
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mkCanonicalDate :: Int -> Month -> Int -> Maybe Date
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mkCanonicalDate year month day = ado
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year' <- toEnum year
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day' <- toEnum day
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in canonicalDate year' month day'
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mkExactDate :: Int -> Month -> Int -> Maybe Date
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mkExactDate year month day = do
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year' <- toEnum year
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day' <- toEnum day
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exactDate year' month day'
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log $ "mkCanonicalDate 2016 Feb 31: " <> show (mkCanonicalDate 2016 February 31)
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log $ "mkExactDate 2016 Feb 31: " <> show (mkExactDate 2016 February 31)
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log $ "mkExactDate 2016 Feb 27: " <> show (mkExactDate 2016 February 27)
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let
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mkDateTime :: Int -> Month -> Int -> Int -> Int -> Int -> Int -> Maybe DateTime
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mkDateTime y month d h m s ms = ado
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date' <- mkCanonicalDate y month d
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time' <- mkTime h m s ms
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in DateTime date' time'
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log $ "mkDateTime 2016 Feb 27 @ 11:04:14:423: " <>
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show (mkDateTime 2016 February 27 11 4 14 423)
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let
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dateTimeValue :: DateTime
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dateTimeValue = unsafePartial $ fromJust $
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mkDateTime 2016 February 27 11 4 14 423
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log $ "Original DateTime: " <> show dateTimeValue
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log $ "Add five seconds: " <> show (adjust (D.Seconds 5.0) dateTimeValue)
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log $ "Add two days: " <> show (adjust (D.Days 2.0) dateTimeValue)
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log $ "Add four hours: " <> show (adjust (D.Hours 4.0) dateTimeValue)
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let
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oneDayDifference = unsafePartial $ fromJust $
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adjust (D.Days 1.0) dateTimeValue
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result :: D.Days
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result = diff oneDayDifference dateTimeValue
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log $ "Number of Days between two dateTimes: " <> show result

‎recipes/DateTimeBasicsLog/web/index.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>DateTimeBasicsLog</title>
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</head>
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<body>
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<script src="./index.js"></script>
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</body>
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</html>

‎recipes/DateTimeBasicsLog/web/index.js‎

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"use strict";
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require("../../../output/DateTimeBasicsLog.Main/index.js").main();

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