How to find Fiscal Month Start & End Date , Fiscal Week Start & End Date for a given Date using Java

This blog explains about getting Fiscal Month Start & End date , Fiscal Week start & end date based on given date using Java API

From the below diagram,

 For October 2013, 9/29/2013 is Fiscal Month Start Date , 11/9/2013 is Fiscal Month End Date
Similarly - 9/29/2013 is fiscal week start date , 10/5/2013 is fiscal week end date for any date b/w 1st to 5th in October.

Implementation

       
    private static GregorianCalendar gregorianCalendar;
    private static final int MAX_WEEKS = 6;

      private static void init(Date date) {
        gregorianCalendar = new GregorianCalendar();
        gregorianCalendar.clear();
        gregorianCalendar.setTime(date);
    }

    /**
     * Returns the Start date of fiscal week based on given input Date
     * @param date
     * @return
     * @throws Exception
     */

    public static Date getFiscalWeekStartDate(Date date) throws Exception {
        if (date != null) {
            init(date);
            return getFiscalWeekStartDate(gregorianCalendar);
        }
        return null;

    }

    private static Date getFiscalWeekStartDate(GregorianCalendar gregorianCalendar) {
        int correction = 1 - gregorianCalendar.get(GregorianCalendar.DAY_OF_WEEK);
        gregorianCalendar.add(Calendar.DATE, correction);
        return gregorianCalendar.getTime();
    }

    /**
     * Returns the Start date of fiscal week based on given input Date
     * @param date
     * @return
     * @throws Exception
     */

    public static Date getFiscalWeekEndDate(Date date) throws Exception {
        if (date != null) {
            init(date);
            return getFiscalWeekEndDate(gregorianCalendar);
        }
        return null;
    }

    private static Date getFiscalWeekEndDate(GregorianCalendar gregorianCalendar) {
        int correction = 7 - gregorianCalendar.get(GregorianCalendar.DAY_OF_WEEK);
        gregorianCalendar.add(Calendar.DATE, correction);
        return gregorianCalendar.getTime();
    }

    /**
     * Returns the Start date of fiscal month based on given input Date
     * @param date
     * @return
     * @throws Exception
     */

    public static Date getFiscalMonthStartDate(Date date) throws Exception {
        if (date != null) {
            init(date);
            int correction = 1 - gregorianCalendar.get(GregorianCalendar.DAY_OF_MONTH);
            gregorianCalendar.add(Calendar.DATE, correction);
            return getFiscalWeekStartDate(gregorianCalendar);
        }
        return null;

    }

    /**
     * Returns the End date of fiscal month based on given input Date
     * @param date
     * @return
     * @throws Exception
     */

    public static Date getFiscalMonthEndDate(Date date) throws Exception {
        if (date != null) {
            int correction = 0;
            init(date);
            int num_of_weeks = gregorianCalendar.getActualMaximum(Calendar.WEEK_OF_MONTH);
            int cur_week = gregorianCalendar.get(Calendar.WEEK_OF_MONTH);
            if (num_of_weeks < MAX_WEEKS) {
                correction = num_of_weeks - cur_week + 1;
            } else {
                correction = num_of_weeks - cur_week;
            }
            gregorianCalendar.add(Calendar.WEEK_OF_MONTH, correction);
            return getFiscalWeekEndDate(gregorianCalendar);
        }

        return null;
    }