diff --git a/src/moment.js b/src/moment.js
index 9516d285db..89afdf71c3 100644
--- a/src/moment.js
+++ b/src/moment.js
@@ -88,7 +88,7 @@ moment.HTML5_FMT = {
TIME: 'HH:mm', //
TIME_SECONDS: 'HH:mm:ss', //
TIME_MS: 'HH:mm:ss.SSS', //
- WEEK: 'YYYY-[W]WW', //
+ WEEK: 'GGGG-[W]WW', //
MONTH: 'YYYY-MM' //
};
diff --git a/src/test/moment/format.js b/src/test/moment/format.js
index 07ed379443..0925f653d8 100644
--- a/src/test/moment/format.js
+++ b/src/test/moment/format.js
@@ -5,16 +5,16 @@ import moment from '../../moment';
module('format');
test('format using constants', function (assert) {
- var m = moment('2017-09-01T23:40:40.678');
- assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL), '2017-09-01T23:40', 'datetime local format constant');
- assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL_SECONDS), '2017-09-01T23:40:40', 'datetime local format constant');
- assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL_MS), '2017-09-01T23:40:40.678', 'datetime local format constant with seconds and millis');
- assert.equal(m.format(moment.HTML5_FMT.DATE), '2017-09-01', 'date format constant');
+ var m = moment('2016-01-02T23:40:40.678');
+ assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL), '2016-01-02T23:40', 'datetime local format constant');
+ assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL_SECONDS), '2016-01-02T23:40:40', 'datetime local format constant');
+ assert.equal(m.format(moment.HTML5_FMT.DATETIME_LOCAL_MS), '2016-01-02T23:40:40.678', 'datetime local format constant with seconds and millis');
+ assert.equal(m.format(moment.HTML5_FMT.DATE), '2016-01-02', 'date format constant');
assert.equal(m.format(moment.HTML5_FMT.TIME), '23:40', 'time format constant');
assert.equal(m.format(moment.HTML5_FMT.TIME_SECONDS), '23:40:40', 'time format constant with seconds');
assert.equal(m.format(moment.HTML5_FMT.TIME_MS), '23:40:40.678', 'time format constant with seconds and millis');
- assert.equal(m.format(moment.HTML5_FMT.WEEK), '2017-W35', 'week format constant');
- assert.equal(m.format(moment.HTML5_FMT.MONTH), '2017-09', 'month format constant');
+ assert.equal(m.format(moment.HTML5_FMT.WEEK), '2015-W53', 'week format constant');
+ assert.equal(m.format(moment.HTML5_FMT.MONTH), '2016-01', 'month format constant');
});
test('format YY', function (assert) {