Rename DAYS_IN_WEEK to DAYS_PER_WEEK. Add MONTHS_PER_YEAR.

samples/swarm/swarm_ui_lib/util/DateUtils.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of utilslib;
 
 /**
  * General purpose date/time utilities.
  */
 class DateUtils {
   // TODO(jmesserly): localized strings
   static const WEEKDAYS = const ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
                                  'Friday', 'Saturday', 'Sunday'];
 
   static const YESTERDAY = 'Yesterday';
 
-  static const MS_IN_WEEK = DateTime.DAYS_IN_WEEK * Duration.MILLISECONDS_PER_DAY;
+  static const MS_IN_WEEK =
+      DateTime.DAYS_PER_WEEK * Duration.MILLISECONDS_PER_DAY;
 
   // TODO(jmesserly): workaround for missing DateTime.fromDate in Dartium
   // Remove this once that is implemented. See b/5055106
   // Parse a string like: "Mon, 27 Jun 2011 15:22:00 -0700"
   static DateTime fromString(String text) {
     final parts = text.split(' ');
     if (parts.length == 1) {
       return _parseIsoDate(text);
     }
 
@@ skipping 120 matching lines @@
     }
   }
 
   // TODO(jmesserly): this is a workaround for unimplemented DateTime.weekday
   // Code inspired by v8/src/date.js
   static int getWeekday(DateTime dateTime) {
     final unixTimeStart = new DateTime(1970, 1, 1, 0, 0, 0, 0);
     int msSince1970 = dateTime.difference(unixTimeStart).inMilliseconds;
     int daysSince1970 = msSince1970 ~/ Duration.MILLISECONDS_PER_DAY;
     // 1970-1-1 was Thursday
-    return ((daysSince1970 + DateTime.THURSDAY) % DateTime.DAYS_IN_WEEK);
+    return ((daysSince1970 + DateTime.THURSDAY) % DateTime.DAYS_PER_WEEK);
   }
 
   /** Formats a time in H:MM A format */
   // TODO(jmesserly): should get 12 vs 24 hour clock setting from the locale
   static String toHourMinutesString(Duration duration) {
     assert(duration.inDays == 0);
     int hours = duration.inHours;
     String a;
     if (hours >= 12) {
       a = 'pm';
       if (hours != 12) {
         hours -= 12;
       }
     } else {
       a = 'am';
       if (hours == 0) {
         hours += 12;
       }
     }
     String twoDigits(int n) {
       if (n >= 10) return "${n}";
       return "0${n}";
     }
     String mm =
         twoDigits(duration.inMinutes.remainder(Duration.MINUTES_PER_HOUR));
     return "${hours}:${mm} ${a}";
   }
 }