Now that the since/fromNow methods use traversal, the date unit

multipliers no longer need to handle special cases for specific dates,
so simplified them to just be numbers.

lib/date.js

@@ -64,70 +64,44 @@
       name: 'year',
       method: 'FullYear',
       ambiguous: true,
-      multiplier: function(d) {
-        var adjust = d ? (isLeapYear(d) ? 1 : 0) : 0.25;
-        return (365 + adjust) * 24 * 60 * 60 * 1000;
-      }
+      multiplier: 365.25 * 24 * 60 * 60 * 1000
     },
     {
       name: 'month',
-      error: 0.919, // Feb 1-28 over 1 month
       method: 'Month',
       ambiguous: true,
-      multiplier: function(d, ms) {
-        var days = 30.4375, inMonth;
-        if(d) {
-          inMonth = getDaysInMonth(d);
-          if(ms <= inMonth * 24 * 60 * 60 * 1000) {
-            days = inMonth;
-          }
-        }
-        return days * 24 * 60 * 60 * 1000;
-      }
+      multiplier: 30.4375 * 24 * 60 * 60 * 1000
     },
     {
       name: 'week',
       method: 'ISOWeek',
-      multiplier: function() {
-        return 7 * 24 * 60 * 60 * 1000;
-      }
+      multiplier: 7 * 24 * 60 * 60 * 1000
     },
     {
       name: 'day',
-      error: 0.958, // DST traversal over 1 day
       method: 'Date',
       ambiguous: true,
-      multiplier: function() {
-        return 24 * 60 * 60 * 1000;
-      }
+      multiplier: 24 * 60 * 60 * 1000
     },
     {
       name: 'hour',
       method: 'Hours',
-      multiplier: function() {
-        return 60 * 60 * 1000;
-      }
+      multiplier: 60 * 60 * 1000
     },
     {
       name: 'minute',
       method: 'Minutes',
-      multiplier: function() {
-        return 60 * 1000;
-      }
+      multiplier: 60 * 1000
     },
     {
       name: 'second',
       method: 'Seconds',
-      multiplier: function() {
-        return 1000;
-      }
+      multiplier: 1000
     },
     {
       name: 'millisecond',
       method: 'Milliseconds',
-      multiplier: function() {
-        return 1;
-      }
+      multiplier: 1
     }
   ];
 
@@ -984,7 +958,7 @@
   // date unit multiplier.
   function getAdjustedUnitForNumber(ms) {
     return getAdjustedUnit(ms, function(unit) {
-      return floor(withPrecision(ms / unit.multiplier(), 1));
+      return floor(withPrecision(ms / unit.multiplier, 1));
     });
   }
 
@@ -1571,7 +1545,7 @@
 
   function buildDateMethods() {
     extendSimilar(date, DateUnits, function(methods, u, i) {
-      var name = u.name, caps = simpleCapitalize(name), multiplier = u.multiplier(), since, until;
+      var name = u.name, caps = simpleCapitalize(name), since, until;
       u.addMethod = 'add' + caps + 's';
 
       function add(num, reset) {
@@ -1581,7 +1555,7 @@
       }
 
       function timeDistanceNumeric(d1, d2) {
-        var n = (d1.getTime() - d2.getTime()) / multiplier;
+        var n = (d1.getTime() - d2.getTime()) / u.multiplier;
         return n < 0 ? ceil(n) : floor(n);
       }
 
@@ -1638,7 +1612,7 @@
       methods[name+'sFromNow'] = since;
 
       methods[u.addMethod] = add;
-      buildNumberToDateAlias(u, multiplier);
+      buildNumberToDateAlias(u, u.multiplier);
     });
   }