Remove deprecated <, <=, >, and >= of DateTime.

sdk/lib/core/date_time.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 dart.core;
 
 /**
  * A DateTime object represents a point in time.
  *
  * It can represent time values that are at a distance of at most
@@ skipping 173 matching lines @@
    */
   bool operator ==(other) {
     if (!(other is DateTime)) return false;
     return (millisecondsSinceEpoch == other.millisecondsSinceEpoch &&
             isUtc == other.isUtc);
   }
 
   /**
    * Returns true if [this] occurs before [other]. The comparison is independent
    * of whether the time is in UTC or in the local time zone.
-   *
-   * *Deprecated* Use [isBefore] instead.
-   */
-  @deprecated
-  bool operator <(DateTime other)
-      => millisecondsSinceEpoch < other.millisecondsSinceEpoch;
-
-  /**
-   * Returns true if [this] occurs at the same time or before [other]. The
-   * comparison is independent of whether the time is in UTC or in the local
-   * time zone.
-   *
-   * *Deprecated* Use [isAfter] instead ([:!isAfter:]).
-   */
-  @deprecated
-  bool operator <=(DateTime other)
-      => millisecondsSinceEpoch <= other.millisecondsSinceEpoch;
-
-  /**
-   * Returns true if [this] occurs after [other]. The comparison is independent
-   * of whether the time is in UTC or in the local time zone.
-   *
-   * *Deprecated* Use [isAfter] instead.
-   */
-  @deprecated
-  bool operator >(DateTime other)
-      => millisecondsSinceEpoch > other.millisecondsSinceEpoch;
-
-  /**
-   * Returns true if [this] occurs at the same time or after [other]. The
-   * comparison is independent of whether the time is in UTC or in the local
-   * time zone.
-   *
-   * *Deprecated* Use [isBefore] instead ([:!isBefore:]).
-   */
-  @deprecated
-  bool operator >=(DateTime other)
-      => millisecondsSinceEpoch >= other.millisecondsSinceEpoch;
-
-  /**
-   * Returns true if [this] occurs before [other]. The comparison is independent
-   * of whether the time is in UTC or in the local time zone.
    */
   bool isBefore(DateTime other) {
     return millisecondsSinceEpoch < other.millisecondsSinceEpoch;
   }
 
   /**
    * Returns true if [this] occurs after [other]. The comparison is independent
    * of whether the time is in UTC or in the local time zone.
    */
   bool isAfter(DateTime other) {
@@ skipping 166 matching lines @@
    * Returns the millisecond into the second [0...999].
    */
   external int get millisecond;
 
   /**
    * Returns the week day [MON..SUN]. In accordance with ISO 8601
    * a week starts with Monday which has the value 1.
    */
   external int get weekday;
 }