Add JSDate-specific now, add fromInstant

bower.json

@@ -19,7 +19,8 @@
     "purescript-datetime": "^3.0.0",
     "purescript-exceptions": "^3.0.0",
     "purescript-foreign": "^4.0.0",
-    "purescript-integers": "^3.0.0"
+    "purescript-integers": "^3.0.0",
+    "purescript-now": "^3.0.0"
   },
   "devDependencies": {
     "purescript-assert": "^3.0.0",

src/Data/JSDate.js

@@ -17,6 +17,10 @@ var createLocalDate = function (y, m, d, h, mi, s, ms) {
   return date;
 };
 
+exports.now = function () {
+  return new Date();
+};
+
 exports.isValid = function (date) {
   return !isNaN(date.getTime());
 };
@@ -30,6 +34,10 @@ exports.toInstantImpl = function (just) {
   };
 };
 
+exports.fromInstant = function (instant) {
+  return new Date(instant);
+};
+
 exports.jsdate = function (parts) {
   return createDate(parts.year, parts.month, parts.day, parts.hour, parts.minute, parts.second, parts.millisecond);
 };

src/Data/JSDate.purs

@@ -14,9 +14,11 @@ module Data.JSDate
   , fromDateTime
   , toDateTime
   , toDate
+  , fromInstant
   , toInstant
   , jsdate
   , jsdateLocal
+  , now
   , parse
   , getTime
   , getUTCDate
@@ -47,7 +49,7 @@ import Prelude
 
 import Control.Monad.Eff (kind Effect, Eff)
 import Control.Monad.Eff.Exception (EXCEPTION)
-
+import Control.Monad.Eff.Now (NOW)
 import Data.Date as Date
 import Data.DateTime (DateTime(..), Date)
 import Data.DateTime as DateTime
@@ -100,6 +102,9 @@ toDateTime = map Instant.toDateTime <$> toInstant
 toDate :: JSDate -> Maybe Date
 toDate = map DateTime.date <$> toDateTime
 
+-- | Creates a `JSDate` from an `Instant` value.
+foreign import fromInstant :: Instant -> JSDate
+
 -- | Attempts to construct an `Instant` for a `JSDate`. `Nothing` is returned
 -- | only when the date value is an invalid date.
 toInstant :: JSDate -> Maybe Instant
@@ -151,6 +156,13 @@ foreign import dateMethod :: forall a. Fn2 String JSDate a
 foreign import parse
   :: forall eff. String -> Eff (locale :: LOCALE | eff) JSDate
 
+-- | Gets a `JSDate` value for the date and time according to the current
+-- | machine's clock.
+-- |
+-- | Unless a `JSDate` is required specifically, consider using the functions in
+-- | `Control.Monad.Eff.Now` instead.
+foreign import now :: forall eff. Eff (now :: NOW | eff) JSDate
+
 -- | Returns the date as a number of milliseconds since 1970-01-01 00:00:00 UTC.
 getTime :: JSDate -> Number
 getTime dt = runFn2 dateMethod "getTime" dt