From 9096a5ff0008dda08314a0e814e32467674cce23 Mon Sep 17 00:00:00 2001
From: ioncreature <great_muchacho@mail.ru>
Date: Wed, 24 Dec 2014 22:52:53 +0300
Subject: [PATCH] Added Date.isValid static method. Added isValid.
 toStartOfDay, toEndOfDay, toStartOfUTCDay, toEndOfUTCDay instance methods

---
 lib/date-utils.js          | 83 +++++++++++++++++++++++++++++++++++++-
 test/date-new-test.js      | 26 ++++++++++++
 test/date-validate-test.js | 19 +++++++++
 3 files changed, 126 insertions(+), 2 deletions(-)

diff --git a/lib/date-utils.js b/lib/date-utils.js
index 6536733..ea6e976 100644
--- a/lib/date-utils.js
+++ b/lib/date-utils.js
@@ -475,6 +475,19 @@ THE SOFTWARE.
         return Date.UTCtoday().add({days: -1});
     };
 
+    /**
+     Returns whether the date is valid
+     @static
+     @param date {Number|String|Date} timestamp or date string or date
+     @returns {Boolean}
+     @function isValid
+     @memberof Date
+     */
+    Date.isValid = function (date) {
+        var d = date instanceof Date ? date : new Date(date);
+        return !isNaN(d.valueOf());
+    };
+
    /**
        Returns whether the day is valid
        @static
@@ -779,7 +792,7 @@ THE SOFTWARE.
     });
 
     /**
-       Sets the time to 00:00:00.0000 and returns a new Date object
+       Sets the time to 00:00:00.000 and returns a Date object
        @returns {Date}
        @function clearTime
        @instance
@@ -795,7 +808,45 @@ THE SOFTWARE.
     });
 
     /**
-       Sets the time to 00:00:00.0000 and returns a new Date object with set to UTC
+     @returns {Boolean}
+     @function isValid
+     @instance
+     @memberof Date
+     */
+    polyfill('isValid', function () {
+        return !isNaN(this.valueOf());
+    });
+
+    /**
+     Sets the time to 00:00:00.000 and returns a Date object
+     @alias clearTime
+     @returns {Date}
+     @function toStartOfDay
+     @instance
+     @memberof Date
+     */
+    polyfill('toStartOfDay', function () {
+        return this.clearTime()
+    });
+
+    /**
+     Sets the time to 23:59:59.999 and returns a Date object
+     @returns {Date}
+     @function toEndOfDay
+     @instance
+     @memberof Date
+     */
+    polyfill('toEndOfDay', function () {
+        this.setHours(23);
+        this.setMinutes(59);
+        this.setSeconds(59);
+        this.setMilliseconds(999);
+
+        return this;
+    });
+
+    /**
+       Sets the time to 00:00:00.000 and returns a new Date object with set to UTC
        @returns {Date}
        @function clearUTCTime
        @instance
@@ -810,6 +861,34 @@ THE SOFTWARE.
         return this;
     });
 
+    /**
+     Sets the time to 00:00:00.000 and returns a Date object with set to UTC
+     @alias clearUTCTime
+     @returns {Date}
+     @function toStartOfUTCDay
+     @instance
+     @memberof Date
+     */
+    polyfill('toStartOfUTCDay', function () {
+        return this.clearUTCTime();
+    });
+
+    /**
+     Sets the time to UTC 23:59:59.999 and returns a Date object
+     @returns {Date}
+     @function toEndOfUTCDay
+     @instance
+     @memberof Date
+     */
+    polyfill('toEndOfUTCDay', function () {
+        this.setUTCHours(23);
+        this.setUTCMinutes(59);
+        this.setUTCSeconds(59);
+        this.setUTCMilliseconds(999);
+
+        return this;
+    });
+
     /**
        Adds `milliseconds`, `seconds`, `minutes`, `hours`, `days`, `weeks`, `months`, and `years` and returns a new Date.
        Usage: `data.add({ "seconds": 10, "days": 1 })`
diff --git a/test/date-new-test.js b/test/date-new-test.js
index ac00c45..368dd5b 100644
--- a/test/date-new-test.js
+++ b/test/date-new-test.js
@@ -38,6 +38,32 @@ vows.describe('Date New').addBatch({
         }
     },
 
+    'toEndOfDay() works': {
+        topic: function() { return new Date().toEndOfDay(); },
+        'returns the correct value': function (date) {
+            var compare = new Date();
+            compare.setHours(23);
+            compare.setMinutes(59);
+            compare.setSeconds(59);
+            compare.setMilliseconds(999);
+
+            assert.equal(date.valueOf(), compare.valueOf());
+        }
+    },
+
+    'toEndOfUTCDay() works': {
+        topic: function() { return new Date().toEndOfUTCDay(); },
+        'returns the correct value': function (date) {
+            var compare = new Date();
+            compare.setUTCHours(23);
+            compare.setUTCMinutes(59);
+            compare.setUTCSeconds(59);
+            compare.setUTCMilliseconds(999);
+
+            assert.equal(date.valueOf(), compare.valueOf());
+        }
+    },
+
     'today() works': {
         topic: function() {
             return Date.today();
diff --git a/test/date-validate-test.js b/test/date-validate-test.js
index 6cb3be8..9f8d755 100644
--- a/test/date-validate-test.js
+++ b/test/date-validate-test.js
@@ -4,6 +4,25 @@ var assert = require('assert');
 require('../lib/date-utils.js');
 
 vows.describe('Date Validate').addBatch({
+    'can validate date object': {
+        'return false for invalid date': function () {
+            var invalidDate = new Date('this is invalid date string');
+            assert.equal(Date.isValid(invalidDate), false);
+            assert.equal(invalidDate.isValid(), false);
+        },
+        'return false for invalid date again': function () {
+            var invalidDate = new Date();
+            invalidDate.setDate( 'this is invalid day number' );
+            assert.equal(Date.isValid(invalidDate), false);
+            assert.equal(invalidDate.isValid(), false);
+        },
+        'return true for valid date': function () {
+            var correctDate = new Date;
+            assert.equal( Date.isValid(correctDate), true );
+            assert.equal( correctDate.isValid(), true );
+        }
+    },
+
     'can deal with hours': {
         topic: function () { return Date; },
         'false for less than 0': function (topic) {