diff --git a/timezonecomplete/timezonecomplete-tests.ts b/timezonecomplete/timezonecomplete-tests.ts
index cb07832a6e..8f91a505c5 100644
--- a/timezonecomplete/timezonecomplete-tests.ts
+++ b/timezonecomplete/timezonecomplete-tests.ts
@@ -1,218 +1,219 @@
-/// <reference path="timezonecomplete.d.ts" />
-
-import tc = require("timezonecomplete");
-
-var b: boolean;
-var n: number;
-var s: string;
-var w: tc.WeekDay;
-
-n = tc.timeUnitToMilliseconds(tc.TimeUnit.Month);
-b = tc.isLeapYear(2014);
-n = tc.daysInMonth(2014, 10);
-n = tc.daysInYear(2014);
-n = tc.dayOfYear(2014, 1, 2);
-w = tc.firstWeekDayOfMonth(2014, 1, tc.WeekDay.Sunday);
-w = tc.lastWeekDayOfMonth(2014, 1, tc.WeekDay.Sunday);
-n = tc.weekDayOnOrAfter(2014, 1, 14, tc.WeekDay.Monday);
-n = tc.weekDayOnOrBefore(2014, 1, 14, tc.WeekDay.Monday);
-n = tc.secondOfDay(13, 59, 59);
-n = tc.weekOfMonth(2014, 1, 1);
-
-// DURATION
-
-var d: tc.Duration;
-var d1: tc.Duration = tc.Duration.hours(24);
-var d2: tc.Duration = tc.Duration.minutes(24);
-var d3: tc.Duration = tc.Duration.seconds(24);
-var d4: tc.Duration = tc.Duration.milliseconds(24);
-var d5: tc.Duration = tc.hours(24);
-var d6: tc.Duration = tc.minutes(24);
-var d7: tc.Duration = tc.seconds(24);
-var d8: tc.Duration = tc.milliseconds(24);
-var d9: tc.Duration = new tc.Duration(24);
-var d10: tc.Duration = new tc.Duration("00:01");
-var d11: tc.Duration = d6.clone();
-var d12: tc.Duration = new tc.Duration(4, tc.TimeUnit.Second);
-
-n = d7.wholeHours();
-n = d7.hours();
-n = d7.minutes();
-n = d7.minute();
-n = d7.seconds();
-n = d7.second();
-n = d7.milliseconds();
-n = d7.millisecond();
-s = d7.sign();
-b = d7.lessThan(d6);
-b = d7.greaterThan(d6);
-d = d7.min(d6);
-d = d7.max(d6);
-d = d7.multiply(3);
-d = d7.divide(0.3);
-d = d7.add(d6);
-d = d7.sub(d6);
-s = d7.toString();
-
-// TIMEZONE
-
-var t: tc.TimeZone;
-var k: tc.TimeZoneKind;
-
-t = tc.TimeZone.local();
-t = tc.TimeZone.utc();
-t = tc.TimeZone.zone(2);
-t = tc.TimeZone.zone("+01:00");
-t = tc.local();
-t = tc.utc();
-t = tc.zone(2);
-t = tc.zone("+01:00");
-t = tc.zone("Europe/Amsterdam", false);
-s = t.name();
-k = t.kind();
-b = t.equals(t);
-b = t.isUtc();
-b = t.dst();
-n = t.offsetForUtc(2014, 1, 1, 13, 0, 5, 123);
-n = t.offsetForZone(2014, 1, 1, 13, 0, 5, 123);
-n = t.offsetForUtcDate(new Date(2014, 1, 1, 13, 0, 5, 123), tc.DateFunctions.Get);
-n = t.offsetForZoneDate(new Date(2014, 1, 1, 13, 0, 5, 123), tc.DateFunctions.GetUTC);
-s = t.toString();
-s = tc.TimeZone.offsetToString(2);
-n = tc.TimeZone.stringToOffset("+00:01");
-
-// REALTIMESOURCE
-
-var date: Date = (new tc.RealTimeSource()).now();
-
-// DATETIME
-
-var dt: tc.DateTime;
-
-var ts: tc.TimeSource = tc.DateTime.timeSource;
-
-dt = tc.DateTime.nowLocal();
-dt = tc.DateTime.nowUtc();
-dt = tc.DateTime.now(tc.TimeZone.local());
-dt = tc.nowLocal();
-dt = tc.nowUtc();
-dt = tc.now(tc.TimeZone.local());
-dt = new tc.DateTime();
-dt = new tc.DateTime("2014-01-01T13:05:01.123 UTC");
-dt = new tc.DateTime("2014-01-01T13:05:01.123", tc.TimeZone.utc());
-dt = new tc.DateTime(date, tc.DateFunctions.Get);
-dt = new tc.DateTime(date, tc.DateFunctions.Get, tc.TimeZone.utc());
-dt = new tc.DateTime(2014, 1, 1, 13, 5, 1, 123);
-dt = new tc.DateTime(2014, 1, 1, 13, 5, 1, 123, tc.TimeZone.utc());
-dt = new tc.DateTime(89949284);
-dt = new tc.DateTime(89949284, tc.TimeZone.utc());
-dt = dt.clone();
-t = dt.zone();
-n = dt.offset();
-n = dt.year();
-n = dt.month();
-n = dt.day();
-n = dt.hour();
-n = dt.minute();
-n = dt.second();
-n = dt.weekNumber();
-n = dt.weekOfMonth();
-n = dt.secondOfDay();
-n = dt.dayOfYear();
-n = dt.millisecond();
-n = dt.unixUtcMillis();
-n = dt.utcYear();
-n = dt.utcMonth();
-n = dt.utcDay();
-n = dt.utcHour();
-n = dt.utcMinute();
-n = dt.utcSecond();
-n = dt.utcMillisecond();
-n = dt.utcWeekNumber();
-n = dt.utcWeekOfMonth();
-n = dt.utcSecondOfDay();
-n = dt.utcDayOfYear();
-s = dt.format("%Y-%m-%d");
-dt.convert(tc.TimeZone.local());
-dt = dt.toZone(tc.TimeZone.utc());
-date = dt.toDate();
-dt = dt.add(tc.Duration.seconds(2));
-dt = dt.add(2, tc.TimeUnit.Year);
-dt = dt.add(2, tc.TimeUnit.Month);
-dt = dt.add(2, tc.TimeUnit.Week);
-dt = dt.add(2, tc.TimeUnit.Day);
-dt = dt.add(2, tc.TimeUnit.Hour);
-dt = dt.add(2, tc.TimeUnit.Minute);
-dt = dt.add(2, tc.TimeUnit.Second);
-dt = dt.addLocal(2, tc.TimeUnit.Second);
-dt = dt.sub(tc.Duration.seconds(2));
-dt = dt.sub(2, tc.TimeUnit.Year);
-dt = dt.sub(2, tc.TimeUnit.Month);
-dt = dt.sub(2, tc.TimeUnit.Week);
-dt = dt.sub(2, tc.TimeUnit.Day);
-dt = dt.sub(2, tc.TimeUnit.Hour);
-dt = dt.sub(2, tc.TimeUnit.Minute);
-dt = dt.sub(2, tc.TimeUnit.Second);
-dt = dt.subLocal(2, tc.TimeUnit.Second);
-d = dt.diff(new tc.DateTime(9289234, tc.TimeZone.local()));
-b = dt.lessThan(new tc.DateTime(9289234, tc.TimeZone.local()));
-b = dt.lessEqual(new tc.DateTime(9289234, tc.TimeZone.local()));
-b = dt.greaterThan(new tc.DateTime(9289234, tc.TimeZone.local()));
-b = dt.greaterEqual(new tc.DateTime(9289234, tc.TimeZone.local()));
-dt = dt.min(new tc.DateTime(9289234, tc.TimeZone.local()));
-dt = dt.max(new tc.DateTime(9289234, tc.TimeZone.local()));
-s = dt.toIsoString();
-s = dt.toString();
-s = dt.toUtcString();
-
-var wd: tc.WeekDay;
-wd = dt.weekDay();
-wd = dt.utcWeekDay();
-
-// PERIOD
-
-s = tc.periodDstToString(tc.PeriodDst.RegularIntervals);
-s = tc.periodDstToString(tc.PeriodDst.RegularLocalTime);
-
-var p: tc.Period;
-
-p = new tc.Period(tc.DateTime.nowLocal(), 1, tc.TimeUnit.Hour, tc.PeriodDst.RegularLocalTime);
-dt = p.start();
-n = p.amount();
-var tu: tc.TimeUnit = p.unit();
-var pd: tc.PeriodDst = p.dst();
-dt = p.findFirst(tc.DateTime.nowLocal());
-dt = p.findNext(dt);
-s = p.toIsoString();
-s = p.toString();
-b = p.isBoundary(dt);
-
-
-// GLOBALS
-d = tc.min(tc.Duration.seconds(2), tc.Duration.seconds(3));
-d = tc.max(tc.Duration.seconds(2), tc.Duration.seconds(3));
-
-dt = tc.min(new tc.DateTime(2), new tc.DateTime(3));
-dt = tc.max(new tc.DateTime(2), new tc.DateTime(3));
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+/// <reference path="timezonecomplete.d.ts" />
+
+import tc = require("timezonecomplete");
+
+var b: boolean;
+var n: number;
+var s: string;
+var w: tc.WeekDay;
+
+n = tc.timeUnitToMilliseconds(tc.TimeUnit.Month);
+b = tc.isLeapYear(2014);
+n = tc.daysInMonth(2014, 10);
+n = tc.daysInYear(2014);
+n = tc.dayOfYear(2014, 1, 2);
+w = tc.firstWeekDayOfMonth(2014, 1, tc.WeekDay.Sunday);
+w = tc.lastWeekDayOfMonth(2014, 1, tc.WeekDay.Sunday);
+n = tc.weekDayOnOrAfter(2014, 1, 14, tc.WeekDay.Monday);
+n = tc.weekDayOnOrBefore(2014, 1, 14, tc.WeekDay.Monday);
+n = tc.secondOfDay(13, 59, 59);
+n = tc.weekOfMonth(2014, 1, 1);
+
+// DURATION
+
+var d: tc.Duration;
+var d1: tc.Duration = tc.Duration.hours(24);
+var d2: tc.Duration = tc.Duration.minutes(24);
+var d3: tc.Duration = tc.Duration.seconds(24);
+var d4: tc.Duration = tc.Duration.milliseconds(24);
+var d5: tc.Duration = tc.hours(24);
+var d6: tc.Duration = tc.minutes(24);
+var d7: tc.Duration = tc.seconds(24);
+var d8: tc.Duration = tc.milliseconds(24);
+var d9: tc.Duration = new tc.Duration(24);
+var d10: tc.Duration = new tc.Duration("00:01");
+var d11: tc.Duration = d6.clone();
+var d12: tc.Duration = new tc.Duration(4, tc.TimeUnit.Second);
+
+n = d7.wholeHours();
+n = d7.hours();
+n = d7.minutes();
+n = d7.minute();
+n = d7.seconds();
+n = d7.second();
+n = d7.milliseconds();
+n = d7.millisecond();
+s = d7.sign();
+b = d7.lessThan(d6);
+b = d7.greaterThan(d6);
+d = d7.min(d6);
+d = d7.max(d6);
+d = d7.multiply(3);
+d = d7.divide(0.3);
+d = d7.add(d6);
+d = d7.sub(d6);
+s = d7.toString();
+
+// TIMEZONE
+
+var t: tc.TimeZone;
+var k: tc.TimeZoneKind;
+
+t = tc.TimeZone.local();
+t = tc.TimeZone.utc();
+t = tc.TimeZone.zone(2);
+t = tc.TimeZone.zone("+01:00");
+t = tc.local();
+t = tc.utc();
+t = tc.zone(2);
+t = tc.zone("+01:00");
+t = tc.zone("Europe/Amsterdam", false);
+s = t.name();
+k = t.kind();
+b = t.equals(t);
+b = t.isUtc();
+b = t.dst();
+n = t.offsetForUtc(2014, 1, 1, 13, 0, 5, 123);
+n = t.offsetForZone(2014, 1, 1, 13, 0, 5, 123);
+n = t.offsetForUtcDate(new Date(2014, 1, 1, 13, 0, 5, 123), tc.DateFunctions.Get);
+n = t.offsetForZoneDate(new Date(2014, 1, 1, 13, 0, 5, 123), tc.DateFunctions.GetUTC);
+s = t.toString();
+s = tc.TimeZone.offsetToString(2);
+n = tc.TimeZone.stringToOffset("+00:01");
+
+// REALTIMESOURCE
+
+var date: Date = (new tc.RealTimeSource()).now();
+
+// DATETIME
+
+var dt: tc.DateTime;
+
+var ts: tc.TimeSource = tc.DateTime.timeSource;
+
+dt = tc.DateTime.nowLocal();
+dt = tc.DateTime.nowUtc();
+dt = tc.DateTime.now(tc.TimeZone.local());
+dt = tc.nowLocal();
+dt = tc.nowUtc();
+dt = tc.now(tc.TimeZone.local());
+dt = new tc.DateTime();
+dt = new tc.DateTime("2014-01-01T13:05:01.123 UTC");
+dt = new tc.DateTime("2014-01-01T13:05:01.123", tc.TimeZone.utc());
+dt = new tc.DateTime(date, tc.DateFunctions.Get);
+dt = new tc.DateTime(date, tc.DateFunctions.Get, tc.TimeZone.utc());
+dt = new tc.DateTime(2014, 1, 1, 13, 5, 1, 123);
+dt = new tc.DateTime(2014, 1, 1, 13, 5, 1, 123, tc.TimeZone.utc());
+dt = new tc.DateTime(89949284);
+dt = new tc.DateTime(89949284, tc.TimeZone.utc());
+dt = dt.clone();
+t = dt.zone();
+n = dt.offset();
+n = dt.year();
+n = dt.month();
+n = dt.day();
+n = dt.hour();
+n = dt.minute();
+n = dt.second();
+n = dt.weekNumber();
+n = dt.weekOfMonth();
+n = dt.secondOfDay();
+n = dt.dayOfYear();
+n = dt.millisecond();
+n = dt.unixUtcMillis();
+n = dt.utcYear();
+n = dt.utcMonth();
+n = dt.utcDay();
+n = dt.utcHour();
+n = dt.utcMinute();
+n = dt.utcSecond();
+n = dt.utcMillisecond();
+n = dt.utcWeekNumber();
+n = dt.utcWeekOfMonth();
+n = dt.utcSecondOfDay();
+n = dt.utcDayOfYear();
+s = dt.format("%Y-%m-%d");
+dt.convert(tc.TimeZone.local());
+dt = dt.toZone(tc.TimeZone.utc());
+date = dt.toDate();
+dt = dt.add(tc.Duration.seconds(2));
+dt = dt.add(2, tc.TimeUnit.Year);
+dt = dt.add(2, tc.TimeUnit.Month);
+dt = dt.add(2, tc.TimeUnit.Week);
+dt = dt.add(2, tc.TimeUnit.Day);
+dt = dt.add(2, tc.TimeUnit.Hour);
+dt = dt.add(2, tc.TimeUnit.Minute);
+dt = dt.add(2, tc.TimeUnit.Second);
+dt = dt.addLocal(2, tc.TimeUnit.Second);
+dt = dt.sub(tc.Duration.seconds(2));
+dt = dt.sub(2, tc.TimeUnit.Year);
+dt = dt.sub(2, tc.TimeUnit.Month);
+dt = dt.sub(2, tc.TimeUnit.Week);
+dt = dt.sub(2, tc.TimeUnit.Day);
+dt = dt.sub(2, tc.TimeUnit.Hour);
+dt = dt.sub(2, tc.TimeUnit.Minute);
+dt = dt.sub(2, tc.TimeUnit.Second);
+dt = dt.subLocal(2, tc.TimeUnit.Second);
+d = dt.diff(new tc.DateTime(9289234, tc.TimeZone.local()));
+b = dt.lessThan(new tc.DateTime(9289234, tc.TimeZone.local()));
+b = dt.lessEqual(new tc.DateTime(9289234, tc.TimeZone.local()));
+b = dt.greaterThan(new tc.DateTime(9289234, tc.TimeZone.local()));
+b = dt.greaterEqual(new tc.DateTime(9289234, tc.TimeZone.local()));
+dt = dt.min(new tc.DateTime(9289234, tc.TimeZone.local()));
+dt = dt.max(new tc.DateTime(9289234, tc.TimeZone.local()));
+s = dt.toIsoString();
+s = dt.toString();
+s = dt.toUtcString();
+dt = dt.startOfDay();
+
+var wd: tc.WeekDay;
+wd = dt.weekDay();
+wd = dt.utcWeekDay();
+
+// PERIOD
+
+s = tc.periodDstToString(tc.PeriodDst.RegularIntervals);
+s = tc.periodDstToString(tc.PeriodDst.RegularLocalTime);
+
+var p: tc.Period;
+
+p = new tc.Period(tc.DateTime.nowLocal(), 1, tc.TimeUnit.Hour, tc.PeriodDst.RegularLocalTime);
+dt = p.start();
+n = p.amount();
+var tu: tc.TimeUnit = p.unit();
+var pd: tc.PeriodDst = p.dst();
+dt = p.findFirst(tc.DateTime.nowLocal());
+dt = p.findNext(dt);
+s = p.toIsoString();
+s = p.toString();
+b = p.isBoundary(dt);
+
+
+// GLOBALS
+d = tc.min(tc.Duration.seconds(2), tc.Duration.seconds(3));
+d = tc.max(tc.Duration.seconds(2), tc.Duration.seconds(3));
+
+dt = tc.min(new tc.DateTime(2), new tc.DateTime(3));
+dt = tc.max(new tc.DateTime(2), new tc.DateTime(3));
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/timezonecomplete/timezonecomplete.d.ts b/timezonecomplete/timezonecomplete.d.ts
index c91f138c61..c0d651c57f 100644
--- a/timezonecomplete/timezonecomplete.d.ts
+++ b/timezonecomplete/timezonecomplete.d.ts
@@ -627,6 +627,11 @@ declare module '__timezonecomplete/datetime' {
          * @return this - other
          */
         diff(other: DateTime): duration.Duration;
+        /**
+         * Chops off the time part, yields the same date at 00:00:00.000
+         * @return a new DateTime
+         */
+        startOfDay(): DateTime;
         /**
          * @return True iff (this < other)
          */