jodatime 时间比较

public ArrayList<CalcPeriod> getCalcPeriods() {
        DateTime now = DateTime.now();
        DateTime.Property year = now.year();

        DateTimeFormatter yyyyMMdd = DateTimeFormat.forPattern("yyyyMMdd");
        DateTime season1 = DateTime.parse(year.get() + Constant.SEASON1,yyyyMMdd);
        DateTime season2 = DateTime.parse(year.get() + Constant.SEASON2,yyyyMMdd);
        DateTime season3 = DateTime.parse(year.get() + Constant.SEASON3,yyyyMMdd);
        DateTime season4 = DateTime.parse(year.get() + Constant.SEASON4,yyyyMMdd);
        //2.1 今年
        ArrayList<CalcPeriod> currentYearList = new ArrayList<>();
        if (now.isBefore(season1)){

        }else if (now.isAfter(season1) && now.isBefore(season2)){
            currentYearList.add(new CalcPeriod(year.get(),"1"));
        }else if (now.isAfter(season2) && now.isBefore(season3)) {
            currentYearList.add(new CalcPeriod(year.get(), "2"));
        }else if (now.isAfter(season3) && now.isBefore(season4)) {
            currentYearList.add(new CalcPeriod(year.get(), "3"));
        }
        //2.2 去年
        ArrayList<CalcPeriod> beforeCurrentYearList = new ArrayList<>();
        for (int i = 2012; i <= year.get() - 1; i++){
            for (int j = 1; j <= 4; j++){
                beforeCurrentYearList.add(new CalcPeriod(i, String.valueOf(j)));
            }
        }
        ArrayList<CalcPeriod> totalList = new ArrayList<>();
        totalList.addAll(currentYearList);
        totalList.addAll(beforeCurrentYearList);
        return totalList;
    }

public class CalcPeriod
{
    private int year;
    private String period;

    public CalcPeriod(int year, String period) {
        this.year = year;
        this.period = period;
    }

    public CalcPeriod() {
    }

    public int getYear()
    {
        return this.year;
    }

    public void setYear(int year) {
        this.year = year;
    }

}

    public static final String SEASON1 = "0331";
    public static final String SEASON2 = "0630";
    public static final String SEASON3 = "0930";
    public static final String SEASON4 = "1231";