1 files changed, 49 insertions, 0 deletions
diff --git a/library/moment/src/lib/units/day-of-year.js b/library/moment/src/lib/units/day-of-year.js
new file mode 100644
index 000000000..0c34fa395
--- /dev/null
+++ b/library/moment/src/lib/units/day-of-year.js
@@ -0,0 +1,49 @@
+import { addFormatToken } from '../format/format';
+import { addUnitAlias } from './aliases';
+import { addRegexToken, match3, match1to3 } from '../parse/regex';
+import { daysInYear } from './year';
+import { createUTCDate } from '../create/date-from-array';
+import { addParseToken } from '../parse/token';
+import toInt from '../utils/to-int';
+
+// FORMATTING
+
+addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear');
+
+// ALIASES
+
+addUnitAlias('dayOfYear', 'DDD');
+
+// PARSING
+
+addRegexToken('DDD',  match1to3);
+addRegexToken('DDDD', match3);
+addParseToken(['DDD', 'DDDD'], function (input, array, config) {
+    config._dayOfYear = toInt(input);
+});
+
+// HELPERS
+
+//http://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
+export function dayOfYearFromWeeks(year, week, weekday, firstDayOfWeekOfYear, firstDayOfWeek) {
+    var week1Jan = 6 + firstDayOfWeek - firstDayOfWeekOfYear, janX = createUTCDate(year, 0, 1 + week1Jan), d = janX.getUTCDay(), dayOfYear;
+    if (d < firstDayOfWeek) {
+        d += 7;
+    }
+
+    weekday = weekday != null ? 1 * weekday : firstDayOfWeek;
+
+    dayOfYear = 1 + week1Jan + 7 * (week - 1) - d + weekday;
+
+    return {
+        year: dayOfYear > 0 ? year : year - 1,
+        dayOfYear: dayOfYear > 0 ?  dayOfYear : daysInYear(year - 1) + dayOfYear
+    };
+}
+
+// MOMENTS
+
+export function getSetDayOfYear (input) {
+    var dayOfYear = Math.round((this.clone().startOf('day') - this.clone().startOf('year')) / 864e5) + 1;
+    return input == null ? dayOfYear : this.add((input - dayOfYear), 'd');
+}