Simple Solidity exercises

PeriodClause.sol

pragma solidity ^0.5.11;

contract DurationClause {
    uint CalendarDaysDuration; // a number of days period, in calendar days.
    address Owner;
    bool Active;
    uint DurationLimit;
    
    constructor(uint initialDuration, uint initialDurationLimit) public {
        CalendarDaysDuration = initialDuration;
        DurationLimit = initialDurationLimit;
        Owner = msg.sender;
        Active = true;
    }
    
    function SetDuration(uint durationInCalendarDays) public {
        require(msg.sender==Owner,
                "Failed. Are you this contract owner?");
        require(durationInCalendarDays <= DurationLimit,
                "New duration bigger than contract defined maximum limit.");
        CalendarDaysDuration = durationInCalendarDays;
    }
    
    function GetDuration() public view returns(uint) {
        return CalendarDaysDuration;
    }
    function GetDurationLimit() public view returns(uint) {
        return DurationLimit;
    }
}