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

@param  datetime the date time to subtract
@return the difference of this and  datetime
Subtracts the specified date time to this and returns the difference . @param datetime the date time to subtract @return the difference of this and datetime
public DateTime minus(
            final DateTime datetime) {
        return minus(datetime.time).minus(datetime.date);
    }
public DateTime minus ( final DateTime datetime ) { return minus ( datetime . time ) . minus ( datetime . date ) ; }
Subtracts the specified date time to this and returns the difference.
Subtracts the specified date time to this and returns the difference .
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