src/edu/kit/informatik/calendar_sample/DateTime.java
/**
     * Adds the specified date time to this and returns the sum.
     * 
     * @param  datetime the date time to add
     * @return the sum of this and {@code datetime}
     */
Adds the specified date time to this and returns the sum.

@param  datetime the date time to add
@return the sum of this and  datetime
Adds the specified date time to this and returns the sum . @param datetime the date time to add @return the sum of this and datetime
public DateTime plus(
            final DateTime datetime) {
        return plus(datetime.time).plus(datetime.date);
    }
public DateTime plus ( final DateTime datetime ) { return plus ( datetime . time ) . plus ( datetime . date ) ; }
Adds the specified date time to this and returns the sum.
Adds the specified date time to this and returns the sum .
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