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 /*
  * Copyright 2003-2007 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.time;
TimeDuration represents time periods expressed in units of hours, minutes, seconds and milliseconds. Whilst we can't say how long a month is without knowing the year and the name of the month, we know how long a second is independant of the date. This is not 100% true for minutes. Minutes can be 59, 60 or 61 seconds long (due to leap seconds) If you ask Duration to convert itself to milliseconds then it will work on the basis of 60 seconds in a minute. If you add or subtract it from a date it will take leap seconds into account

Author(s):
John Wilson tug@wilson.co.uk
public class TimeDuration extends Duration {
    public TimeDuration(final int hoursfinal int minutesfinal int secondsfinal int millis) {
        super(0, hoursminutessecondsmillis);
     }
    
    public TimeDuration(final int daysfinal int hoursfinal int minutesfinal int secondsfinal int millis) {
        super(dayshoursminutessecondsmillis);
     }
    
    public Duration plus(final Duration rhs) {
        return new TimeDuration(this.getDays() + rhs.getDays(), this.getHours() + rhs.getHours(),
                                this.getMinutes() + rhs.getMinutes(), this.getSeconds() + rhs.getSeconds(),
                                this.getMillis() + rhs.getMillis());
    }
    
    public DatumDependentDuration plus(final DatumDependentDuration rhs) {
        return new TimeDatumDependentDuration(rhs.getYears(), rhs.getMonths(),
                                              this.getDays() + rhs.getDays(), this.getHours() + rhs.getHours(),
                                              this.getMinutes() + rhs.getMinutes(), this.getSeconds() + rhs.getSeconds(),
                                              this.getMillis() + rhs.getMillis());
    }
    
    public Duration minus(final Duration rhs) {
        return new TimeDuration(this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                                this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                                this.getMillis() - rhs.getMillis());
    }
    
    public DatumDependentDuration minus(final DatumDependentDuration rhs) {
        return new TimeDatumDependentDuration(-rhs.getYears(), -rhs.getMonths(),
                                              this.getDays() - rhs.getDays(), this.getHours() - rhs.getHours(),
                                              this.getMinutes() - rhs.getMinutes(), this.getSeconds() - rhs.getSeconds(),
                                              this.getMillis() - rhs.getMillis());
    }
    
    public From getFrom() {
        return new From() {
            public Date getNow() {
            final Calendar cal = Calendar.getInstance();
                cal.add(.TimeDuration.this.getDays());
                cal.add(.TimeDuration.this.getHours());
                cal.add(.TimeDuration.this.getMinutes());
                cal.add(.TimeDuration.this.getSeconds());
                cal.add(.TimeDuration.this.getMillis());
                
                return cal.getTime();
            }
        };
    }
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