Add a difference method to SC.DateTime

This method allow to compute the number of weeks, days, hours, minutes, or seconds between two dates.
nicolasbadia · Oct 5, 2012 · 2f02e5f · 2f02e5f · dcporter · Oct 23, 2012
1 parent 066ae08
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diff --git a/frameworks/datetime/frameworks/core/system/datetime.js b/frameworks/datetime/frameworks/core/system/datetime.js
@@ -1127,8 +1127,42 @@ SC.DateTime.mixin(SC.Comparable,
     var ma = a.adjust({hour: 0}).get('milliseconds');
     var mb = b.adjust({hour: 0}).get('milliseconds');
     return ma < mb ? -1 : ma === mb ? 0 : 1;
+  },
+
+  /**
+    This will tell you the interval of time between the two passed DateTime.
+    You can display the difference in week (w), day (d), hour (h), minute (M)
+    and second (S)
+
+    @param {SC.DateTime} a the first DateTime instance
+    @param {SC.DateTime} b the second DateTime instance
+    @param {String} format the interval to get the difference in
+  */
+  difference: function(a, b, format) {
+    var ma = a.get('milliseconds'),
+        mb = b.get('milliseconds'),
+        diff = mb - ma,
+        divider;
+
+    switch(format) {
+      case 'd': 
+      case 'D': divider = 864e5; break; // day: 1000 * 60 * 60 * 24
+      case 'h': 
+      case 'H': divider = 36e5; break; // hour: 1000 * 60 * 60
+      case 'M': divider = 6e4; break; // minute: 1000 * 60
+      case 'S': divider = 1e3; break; // second: 1000
+      case 's': divider = 1; break;
+      case 'W': divider = 6048e5; break; // week: 1000 * 60 * 60 * 24 * 7
+      default: throw format+" is not supported"; break;
+    }
+
+    var ret = diff/divider;
+
+    return ret>0?Math.floor(ret):Math.ceil(ret);
   }
 
+
+
 });
 
 /**

diff --git a/frameworks/datetime/frameworks/core/tests/system/datetime.js b/frameworks/datetime/frameworks/core/tests/system/datetime.js
@@ -402,3 +402,17 @@ test('extend', function() {
   var parsedDateTimeExt = dateTimeExt.parse('2011-10-15T21:30:00Z');
   ok(SC.instanceOf(parsedDateTimeExt, dateTimeExt), 'Correctly produced an instance of the extended type.');
 });
+
+test('difference', function() {
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-08', '%Y-%m-%d'), SC.DateTime.parse('2010-12-18', '%Y-%m-%d'), 'W'), 1);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-01-01', '%Y-%m-%d'), SC.DateTime.parse('2010-02-01', '%Y-%m-%d'), 'W'), 4);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-02-01', '%Y-%m-%d'), SC.DateTime.parse('2010-01-01', '%Y-%m-%d'), 'W'), -4);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-08', '%Y-%m-%d'), SC.DateTime.parse('2010-12-09', '%Y-%m-%d'), 'd'), 1);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-18', '%Y-%m-%d'), SC.DateTime.parse('2010-12-09', '%Y-%m-%d'), 'd'), -9);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 02:00:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:00:00', '%Y-%m-%d %H:%M:%S'), 'H'), -1);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 01:00:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:10:00', '%Y-%m-%d %H:%M:%S'), 'H'), 0);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 01:00:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:50:00', '%Y-%m-%d %H:%M:%S'), 'H'), 0);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 01:01:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:10:10', '%Y-%m-%d %H:%M:%S'), 'M'), 9);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 01:00:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:00:20', '%Y-%m-%d %H:%M:%S'), 'S'), 20);
+  equals(SC.DateTime.difference(SC.DateTime.parse('2010-12-09 01:10:00', '%Y-%m-%d %H:%M:%S'), SC.DateTime.parse('2010-12-09 01:00:00', '%Y-%m-%d %H:%M:%S'), 'S'), -600);
+});